Database Info

Phone Call Recorder

I need to record phone calls. My boss screams at me like a demon monster, and I'd like to preserve this fresh Hell for posterity... maybe make it my ringtone. (Yes, I have a right to in my state, as I am a party to the call)
Searching on AppBrain for 'phone call recorder' gives 13,997 results.
Ideally I'd like it to automatically start when I get a call from a certain number, and otherwise have a push-button start/stop while calls are in progress, and any other time.
Can anyone advise?

Quantumstate said:
I need to record phone calls. My boss screams at me like a demon monster, and I'd like to preserve this fresh Hell for posterity... maybe make it my ringtone. (Yes, I have a right to in my state, as I am a party to the call)
Searching on AppBrain for 'phone call recorder' gives 13,997 results.
Ideally I'd like it to automatically start when I get a call from a certain number, and otherwise have a push-button start/stop while calls are in progress, and any other time.
Can anyone advise?
Click to expand...
Click to collapse
I think Google Voice has this feature, but it lets the other party know via an in-call announcement.

esone1ll said:
I think Google Voice has this feature, but it lets the other party know via an in-call announcement.
Click to expand...
Click to collapse
Thanks, but no Google apps please. Don't trust them. Open-source is best.

Quantumstate said:
Thanks, but no Google apps please. Don't trust them. Open-source is best.
Click to expand...
Click to collapse
Interesting choice of phone platforms given that you don't trust Google.
By the way, much of Google's software is open source with that source code freely available, including Android.
Though I've only looked for this in Nexus One forums, it seems that no one can figure out how to get an application (at least not involving GV) to capture audio on both sides of the conversation, unless it's on speaker or maybe a headset. Might vary by device though if it's a hardware thing.

d0ugie said:
Interesting choice of phone platforms given that you don't trust Google.
Click to expand...
Click to collapse
Long story. Sure you want to know?
http://forum.xda-developers.com/showthread.php?t=730544
Yes N1 is the phone of concern. Odd that it's difficult to capture both sides. Shouldn't be difficult to emulate GV by looking at the source.

I was going to suggest Google Voice also. When you hit the number 2 or 4 (can't remember which), it will notify you and the other caller that the session is being recorded (which might shut your boss up for good!). You can even download the conversation into an mp3 format. It records both sides of the conversation, not just yours or his.
Now, why would Google give a crap what your boss is yelling about? My point exactly ... this isn't Big Brother ... yet.

Read that other thread to find out, if you're actually curious.
I notice that comments in many of the call recording apps say 'doesn't work', with one phone or another, usually newer phones. And I am gathering that G**gle Voice is closed-source, as are apparently many of their other apps, so reading source for tips on how to get both sides is not an option.
I wouldn't use G**gle apps in any case, but to notify my boss I am recording would probably get me fired today. I'm just wanting to collect his fiery, abusive calls just in case...

Apparently most apps are unable to record the other party's side of the conversation.
Does anyone know why this would be? What would it take to record both sides. I'm sure there are hooks in Android to get this.

All right, after considerable research it seems I am the best-informed around here.
It is now clear that there is no way a third-party app can record the orther end of the conversation, except in speakerphone mode. (MIC ONLY). Only Google Voice can do this, and it insists on using 'The Cloud' so they have control over all your conversations.
There is confusion over whether this is an API problem, or a driver problem, but if it's a driver problem both HTC and Motorola suffer from it.
So, this is a deal-breaker. No Android phone for me. I'm lucky I'm not already stuck with one.
Winduhs Mobile phones can record with third-party apps, as can the Symbian-based Nokia N8 when it comes out next month. So that's where I'm going.
Good bye Android

Hate to tell you this but you are butting you head up against a long time limitation of the "Smartphone" platform. It isn't limited to Android devices either. WinMo has the same limitations and it has to do with the OS not having access to the incoming audio stream.

Not true. Google Voice can do it, built-in, but I'm not sending all recordings to them, no sir.
This proves that the mechanisms are in place but that either the API is rigged, the drivers are, or documentation is lying. Everything records as documented in the emulated SDK, but not on the phone itself.
Phones that actually can record both sides are Nokia S60 & Maemo phones, including N900 & N8 (Recaller, Voxtrack Personal- beepless), Rseven on Symbian & WM, Mvoice & CallRec on Palm, Vito-Audionotes on HTC TouchPro2, Sony Ericsson c905 has the record option.
Right now I'm looking for a Linux port to any of the newer smartphones, as Linux can record and has nav apps, my two vital functions.

Quantumstate said:
Not true. Google Voice can do it, built-in, but I'm not sending all recordings to them, no sir.
This proves that the mechanisms are in place but that either the API is rigged, the drivers are, or documentation is lying. Everything records as documented in the emulated SDK, but not on the phone itself.
Click to expand...
Click to collapse
That doesn't prove anything. Google Voice calls go through their servers. I can record calls between two landlines, if the call is made through GVoice. Does this mean that my 1970s-era, rotary-dial phone has the SDK to record calls?

It proves that I can't use Android.
I am not going to bicker with you.

This thread is comedy gold. There are several reasons why access the audio stream is restricted. Phones from many platforms cannot record both sides of the conversation, and I am surprised to hear that 3rd party apps can do this on WinMo. I would hazzard a guess that this requires more than just a regular run of the mill type install.
You seem to hate Android, and Google in particular. I have read your posts. I thank you for your lack of contribution to the forum. A good chuckle doesn't really count.
Your fear mongering and paranoia regarding big business and biased news is typical of someone living behind a computer for 52 years. Oh yes, that's you too. If you wish to spread your opinion, I would suggest you start a blog, rather than fill a forum with posts like these.
Take care.

Voice recorder app on win mobile
Until about 10 days ago when I bought my first android phone, a samsung vibrant which i am loving it, I was a windows mobile user for many years and it's true that there is an free app called PMrecoder, that records phone conversation (both sides) and saves it in a folder on the SD card. I still have the app on my Tmobile wing. This app works great and records all coversations automatically. I wish there was an app like that for android also. I am sure someone will come up with a similar app for android soon.

You have nothing but insults "SpeeDemon". {snicker}
Means nothing.
But thanks mayart, for another app that works.

total recall (paid app, about 10 dollards) tryes to do the job.
I've buy it, but...nobody never calls me.
Seriously: i come from an excellent nokia E65. It knew how to record some in's and out's very efficiently.

Doesn't work on Nexus One...

You should send a mail to the developers (company).
I think they want now to be efficient on Android phones, as they are for ages
on symbian (Nokia) ones.

Ah, never mind, I've found an app that does it.
However because of the abuse I was given in this thread I am not sharing it with this forum.
Have a nice day.

Email Client Frustrations and Samsung Response

I am coming from Blackberry and therefore have high standards for email clients. After trying every workaround that I could find from forums, I sent an email to Samsung with my recommendations for future software updates. I am not surprised by the response. On a side note, I fixed the GAL issue by installing "Swift Contacts" from the market but in my opinion all of these features should be out of the box functionality in a modern smartphone especially if iOS has it. I am running Touchdown in parallel right now to see if it is worth the $20 but this phone should do these things stock. Am I crazy for having these expectations?
　
Subject: Email Client
I have had my Captivate for 3.5 weeks. While I love it for many reasons, and besides my major gripe with the GPS performance, I continue to struggle with the email functionality as a past Blackberry user. The stock email client lacks many basic features that Blackberry and iPhone have. Is there any plan to fix the following basic Smartphone/Activesync functionality in an upcoming software update?
- GAL support (global address list)
- Cut/Copy/Paste
- Move email between folders
- Meeting request Accept/Tentative/Decline w/ or w/o message
- Syncronized draft folder w/ exchange
- Create calendar appt. and choose'show time as' free/busy/tentative/out of office.
If there is a way to do any of these thing now, I would appreciate the instructions. Otherwise will these be addressed in future software releases? I am debating switching back to Blackberry really want to make this phone work for me!
Samsung Response:
Thank you for your inquiry. Unfortunately, we are unable to speculate when/if a software revision with this feature might be available due to the fact that this might lead to inaccurate information and confusion.
Please feel free to check back with us periodically for updates. We hope that you will allow us another opportunity to serve you.
Should you desire additional assistance resolving this, we invite you to call Samsung Customer Support by phone at our toll free number 1-888-987-4357 between the hours 7:00 a.m. to 9:00 p.m. Monday through Friday, and 9:00 a.m. to 6:00 p.m. Saturday, Central Standard Time.
Sincerely,
Samsung Technical Support

- Meeting request Accept/Tentative/Decline w/ or w/o message
- Syncronized draft folder w/ exchange
- Create calendar appt. and choose'show time as' free/busy/tentative/out of office.
Click to expand...
Click to collapse
I'm sure there's an app out there for this stuff, but android is not a business oriented client and as such these are not things "normal" users would need.
I use the gmail app that came on the phone and it has cut copy and paste.
you'll have to define GAL, again the gmail client has access to all your gmail contacts, which is everyone I know since you can easily sync all your contacts with gmail (even phone numbers)
again, a gmail user, but gmail doesn't really have folders it has labels, which is more or less the same from the users point of view, and this can be done, moving labels...
apps are your friend, search appbrain for the things you need, ex: http://www.appbrain.com/search?q=exchange
hope some of that helps

I'm sure there's an app out there for this stuff, but android is not a business oriented client and as such these are not things "normal" users would need.
Click to expand...
Click to collapse
Thanks for your feedback but I do not accept that Android is not business oriented and only for "normal" users. Many companies that are not on AT&T and therefore can't get an iPhone are allowing android phones form Verizon and others. iPhone can do all of these things and many other Android phones have much more client email functionality. For some reason this Samsung version is hobbled. If Android is going to succeed and eventually dominate in the market any new phone platform must have basic business functionality that is expected with any Exchange implementation using Activesync. If an app like Touchdown can do these things then the stock client should be able to. For Android to win it must work for both business and "normal" consumers.
Also, how do you have cut and paste in gmail? Are you rooted? I do't have it and have read many threads complaining about the lack of this feature.

A couple corrections:
1. cut/paste is there and pretty easy to use - if using the samsung keyboard, tap and hold the 123 key. Viola, you get a directional pad with cut/paste functions, that works very well.
2. GAL is available when composing an email. instead of typing a name, hit the search button near the name box; this will search the server - downside; you only get email address, not phone numbers
3. you missed my biggest annoyance: not being able to dial a phone number in a calendar invite/meeting - phone numbers and urls are not recognized as links. You have to "edit" then copy paste.
These are not android deficiencies, they are Samsung's. Other android phones do not have these problems. So hopefully a 2.1 update, or 2.2 will fix all this. If not we should have some Vanilla (Plain Android) Roms to use in the near future.

orb_526 said:
Thanks for your feedback but I do not accept that Android is not business oriented and only for "normal" users. Many companies that are not on AT&T and therefore can't get an iPhone are allowing android phones form Verizon and others. iPhone can do all of these things and many other Android phones have much more client email functionality. For some reason this Samsung version is hobbled. If Android is going to succeed and eventually dominate in the market any new phone platform must have basic business functionality that is expected with any Exchange implementation using Activesync. If an app like Touchdown can do these things then the stock client should be able to. For Android to win it must work for both business and "normal" consumers.
Also, how do you have cut and paste in gmail? Are you rooted? I do't have it and have read many threads complaining about the lack of this feature.
Click to expand...
Click to collapse
I am rooted but I doubt that is it, I am running the jh2 update, that may be it, but if I tap and hold,i get the option to cut, copy, and paste. As mentioned above hitting 123 also works, and if you're using swype tap the swype key and swype right, to the "sym" button to get the same thing.
As for the other androids that are more business oriented, they just have different apps, which is why android is awesome, I don't want your features, and you don't want mine, so we just download different apps, and everyone is happy.
Sent from my SAMSUNG-SGH-I897 using XDA App

screwyluie said:
I am rooted but I doubt that is it, I am running the jh2 update, that may be it, but if I tap and hold,i get the option to cut, copy, and paste. As mentioned above hitting 123 also works, and if you're using swype tap the swype key and swype right, to the "sym" button to get the same thing.
As for the other androids that are more business oriented, they just have different apps, which is why android is awesome, I don't want your features, and you don't want mine, so we just download different apps, and everyone is happy.
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
If you are rooted and on JH2 then I would classify you as a super users. I understand all of your points and this is why Android is so great! But I am also very invested in Android now and want it to be successful in the market for the benefit of all users. A large majority of users are not power users. Buy an iPhone or a Blackberry or even another Android phone and these basic Corporate Exchange features are working out of the box. Most people do not have the skill or patience to try multiple apps until they find one that works. And most people do not want to spend more money to make their phone do the most basic functions. The Captivate is the only Android phone on AT&T that most corporate users would consider. Even if you don't want or need these features, many will, and it is Samsung not Google that messed up. Samsung should provide this high level device with the features to make it competitive out of the box. These basic features would not deter or impact the non-corporate user in any way so why not include them?
Do you have the "Copy Paste It" app installed? I even tried again and I do not have Copy/Paste in Gmail. What I mean is I cannot copy and paste from the quoted text. I can from the text I am adding. I know how to use the keyboard text select features. If I am missing something I would love to be corrected and figure this thing out!

These basic features would not deter or impact the non-corporate user in any way so why not include them?
Do you have the "Copy Paste It" app installed? I even tried again and I do not have Copy/Paste in Gmail. What I mean is I cannot copy and paste from the quoted text. I can from the text I am adding. I know how to use the keyboard text select features. If I am missing something I would love to be corrected and figure this thing out!
Click to expand...
Click to collapse
I would blame att as much as samsung.. perhaps if att had more android phones instead of sticking with the iphone, we would have corporate android.... as it stands I'm just happy we have a high end android at all.
as for copying, no i can not copy from the quoted text, you are correct

alphadog00 said:
A couple corrections:
1. cut/paste is there and pretty easy to use - if using the samsung keyboard, tap and hold the 123 key. Viola, you get a directional pad with cut/paste functions, that works very well.
2. GAL is available when composing an email. instead of typing a name, hit the search button near the name box; this will search the server - downside; you only get email address, not phone numbers
3. you missed my biggest annoyance: not being able to dial a phone number in a calendar invite/meeting - phone numbers and urls are not recognized as links. You have to "edit" then copy paste.
These are not android deficiencies, they are Samsung's. Other android phones do not have these problems. So hopefully a 2.1 update, or 2.2 will fix all this. If not we should have some Vanilla (Plain Android) Roms to use in the near future.
Click to expand...
Click to collapse
1. It is not possible to cut/copy/paste from the quoted text. This is the whole point for me. If somebody sends me an email with information, sometimes I want to copy a subset of that information into another email or app. That is not possible with either the stock email client or gmail.
2. For some reason GAL was not working for me out of the box and believe me I tried mutlitple times. I tried installing Swift Contacts and all of the sudden it worked. I can explain it but at least it works. Too bad it does not show the phone number.
3. I had not noticed this before but now that I have, I have another thing to be frustrated about. Thanks
Hopefully Samsung fixes these issues in an upcoming build otherwise I will be rooting for sure.

[Forward]WhosCall let you prevent phone fraud

******** WhosCall commitment to free forever ********
From Taiwan app development team, has recently been named Google Chairman Eric Schmidt said very useful .It has globally downloads of nearly one million, how do they make it?
When the phone rings, the first action should be able to see the phone screen to check is where the phone call, and then decide not to pick up, but if the screen show is a bunch of strange phone number, then there will be a doubt, who called me? The company I met yesterday? Or last night I got drunk and left the phone to an hottie? Maybe finnaly is prepaid card telephone fraud. If we can pick up the phone before knowing who it is, you can quickly judge whether pick the phone, or prevent the embarrassing situation that pick up but not know who this is. The software is to search the data of strange phone calls at the same time, as well as block the call which you do not want to take , you can also sync the blacklist of telephone fraud, and reduce the chance of harassment.
The software can be the most important received unknown calls , deliver the speaker information and effectively to identify the business, fraud, marketing, business and other unknown caller, and through the block phone share so that more people can download the list of recommendations blockade. Let's hand with anti-fraud!
About this app:
Language: Chinese, English
*Because of UI restrictics only Android version, and in the future we plans to launch iOS version, please give us any suggestions let us making better.

Juniper Networks study reveals how dangerous Android is to our privacy

Okay, so, I summed up some 5 articles on this subject - in the hope of starting a discussion about device security. I hope you will find this interesting and meaningful and perhaps you will find out about some of the risks of using Android.
2 months ago Juniper Networks, one of the two biggest network equipment manufactures, published a blog post (1) about an intensive research their mobile threat department had on the Android market place.
In essence they analyzed over 1.7 million apps in Google Play, revealing frightening results and prompting a hard reality check for all of us.
One of the worrying findings is that a significant number of applications contain capabilities that could expose sensitive information to 3rd parties. For example, neither Apple nor Google requires apps to ask permission to access some forms of the device ID, or to send it to outsiders. A Wall Street Journal examination (2) of 101 popular Android (and iPhone) apps found that showed that 56 — that's half — of the apps tested transmitted the phone's unique device ID to other companies without users' awareness or consent. 47 apps — again, almost a half — transmitted the phone's location to other companies.
That means that the apps installed in your phone are 50% likely to clandestinely collect and sell information about you without your knowledge nor your consent. For example when you give permission to an app to see your location, most apps don't disclose if they will pass the location to ad companies.
Moving on to more severe Android vulnerabilities. Many applications perform functions not needed for the apps to work — and they do it under the radar! The lack of transparency about who is collecting information and how it is used is a big problem for us.
Juniper warns, that some apps request permission to clandestinely initiate outgoing calls, send SMS messages and use a device camera. An application that can clandestinely initiate a phone call could be used to silently listen to ambient conversations within hearing distance of a mobile device. I am of course talking about the famous and infamous US Navy PlaceRaider (3).
Thankfully the Navy hasn't released this code but who knows if someone hadn't already jumped on the wagon and started making their own pocket sp?. CIO magazine (4) somewhat reassures us though, that the "highly curated nature of [smartphone] application stores makes it far less likely that such an app would "sneak through" and be available for download."
A summary by The Register (5) of the Juniper Networks audit reads that Juniper discovered that free applications are five times more likely to track user location and a whopping 314 percent more likely to access user address books than paid counterparts. 314%!!!
1 in 40 (2.64%) of free apps request permission to send text messages without notifying users, 5.53 per cent of free apps have permission to access the device camera and 6.4 per cent of free apps have permission to clandestinely initiate background calls. Who knows, someone might just be recording you right now, or submitting your photo to some covert database in Czech Republic — without you even knowing that your personal identity is being compromised.
Google, by the way, is the biggest data recipient — so says The Wall Street Journal. Its AdMob, AdSense, Analytics and DoubleClick units collected data from 40% of the apps they audited. Google's main mobile-ad network is AdMob, which lets advertisers target phone users by location, type of device and "demographic data," including gender or age group.
To quote the The Register on the subjec, the issue of mobile app privacy is not new. However Juniper's research is one of the most comprehensive looks at the state of privacy across the entire Google Android application ecosystem. Don't get me wrong. I love using Google's services and I appreciate the positive effect this company has had over how I live my life. However, with a shady reputation like Google's and with it's troubling attitude towards privacy (Google Maps/Earth, Picasa's nonexistent privacy and the list goes on) I sincerely hope that after reading this you will at least think twice before installing any app.
Links: (please excuse my links I'm a new user and cannot post links)
(1) forums.juniper net/t5/Security-Mobility-Now/Exposing-Your-Personal-Information-There-s-An-App-for-That/ba-p/166058
(2) online.wsj com/article/SB10001424052748704694004576020083703574602.html
(3) technologyreview com/view/509116/best-of-2012-placeraider-the-military-smartphone-malware-designed-to-steal-your-life/
(4) cio com/article/718580/PlaceRaider_Shows_Why_Android_Phones_Are_a_Major_Security_Risk?page=2&taxonomyId=3067
(5) theregister co.uk/2012/11/01/android_app_privacy_audit/
____________________________________________________________________________________________
Now I am proposing a discussion. Starting with - do we have the possibility to monitor device activity on the phone? By monitoring device activity, such as outgoing SMSs and phone calls in the background, the camera functions and so on we can tell if our phone is being abused under the radar and against our consent. What do you think?
.

I am finding it sad and troubling but even more so ironic that nobody here cares about this stuff.

Pdroid allows you to tailor your apps and what permissions your device actually allows on a per app basis. Requires some setup, and the GUI is nothing fancy.. but for those worried about permissions, it is quite ideal.
Edit : http://forum.xda-developers.com/showthread.php?t=1357056
Great project, be sure to thank the dev
Sent from my ADR6425LVW using Tapatalk 2

DontPushButtons said:
Pdroid allows you to tailor your apps and what permissions your device actually allows on a per app basis
Click to expand...
Click to collapse
Sounds good for a start, I'll look it up

pilau said:
Sounds good for a start, I'll look it up
Click to expand...
Click to collapse
Okay, so I looked it up, and Pdroid does look like a fantastic solution to control what apps have access to what information on your droid.
However, it doesn't cover monitoring hardware functions such as texts being sent, calls being placed etc. as described in the OP. Besides, it only works in Gingerbread as far as I could gather.
EDIT: looking at PDroid 2.0, it does exactly what I originally asked

pilau said:
Okay, so I looked it up, and Pdroid does look like a fantastic solution a control what apps have access to what information on you droid.
However, it doesn't cover monitoring hardware functions such as texts being sent, calls being placed etc. as described in the OP. Besides, it only works in Gingerbread as far as I could gather.
Click to expand...
Click to collapse
I actually first found out about it on an ics rom, so it's definitely not just gb. As for monitoring, no clue. Any sort of extra process logging would likely bog down resources or space eventually.
Sent from my ADR6425LVW using Tapatalk 2

DontPushButtons said:
Any sort of extra process logging would likely bog down resources or space eventually.
Click to expand...
Click to collapse
I definitely wouldn't know. This solution looks very complicated in first impression but on the Google play page it says 100% no performance effects.
Anyway, I looked up PDroid 2.0 here on XDA, which is the rightful successor of the original app. It does everything the original app does and also monitors many device activities! Here is the full list of features. I would add a working link but I'm still a n00b and I am restricted from doing so. Sigh....
forum.xda-developers com/showthread.php?t=1923576
PDroid 2.0 allows blocking access for any installed application to the following data separately:
Device ID (IMEI/MEID/ESN)
Subscriber ID (IMSI)
SIM serial (ICCID)
Phone and mailbox number
Incoming call number
Outgoing call number
GPS location
Network location
List of accounts (including your google e-mail address)
Account auth tokens
Contacts
Call logs
Calendar
SMS
MMS
Browser bookmarks and history
System logs
SIM info (operator, country)
Network info (operator, country)
IP Tables(until now only for Java process)
Android ID
Call Phone
Send SMS
Send MMS
Record Audio
Access Camera
Force online state (fake online state to permanent online)
Wifi Info
ICC Access (integrated circuit-card access, for reading/writing sms on ICC)
Switch network state (e.g. mobile network)
Switch Wifi State
Start on Boot (prevents that application gets the INTENT_BOOT_COMPLETE Broadcast)

I've always had the luxury of someone else integrating it into the Rom, then I just had to set it up through the app. It is time-consuming, but not very difficult at all. I say give it a shot and see if that's what you had in mind. Maybe the logging is less detrimental than I had previously thought.
I'm sure you could get your post count up by asking for some tips in that thread. Every forum on xda has at least one person that's EXCESSIVELY helpful, frequently more. So have a ball
Sent from my ADR6425LVW using Tapatalk 2

To any call blocker app develper out here

I have recently been having issues with lots of spam calls from different numbers from a same (or several) call center(s) for a same ad offer.
I have a call blocker installed, where i manually ad the numbers, but I am thinking it is not the most efficient for every user out there to do the same thing over and over again. I'm thinking it'll be wise to have a public registry of spammer numbers reported by users by country. And an app that that let users report numbers, and then push and pull numbers from the server. Perhaps something open source or free software for everyone to take advantage of.
Has something like that been done? or someone interested in?

Do any blockers work right on Nougat?
https://forum.xda-developers.com/moto-z-play/how-to/people-realize-call-blocking-apps-t3666123

cpucpu said:
I have recently been having issues with lots of spam calls from different numbers from a same (or several) call center(s) for a same ad offer.
I have a call blocker installed, where i manually ad the numbers, but I am thinking it is not the most efficient for every user out there to do the same thing over and over again. I'm thinking it'll be wise to have a public registry of spammer numbers reported by users by country. And an app that that let users report numbers, and then push and pull numbers from the server. Perhaps something open source or free software for everyone to take advantage of.
Has something like that been done? or someone interested in?
Click to expand...
Click to collapse
Google Phone app does exactly what you have described, though it takes time for their algorithm to decide that a particular phone number is used for spam calls. If it really bothers you, the best thing you can do is to block calls from unknown phone numbers or you may use Google Voice and require unknown callers introduce themselves.