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[INFO] VOIP on the Galaxy Nexus

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By urinsane, Senior Member on 5th April 2012, 09:14 AM
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Some of us have been discussing VOIP options over in the prepaid thread ( ) and thought we might as well break it off into it's own thread. While this could probably be a more general Android thread, I thought it best to remain specific for what works on OUR devices, as CPU/software do make a difference.

Let me preface by saying I am still a VOIP newb. I've got the basics down (I think) but I welcome any and all advice or suggestions on things to add. I'm sure I got some things wrong. Obviously there are quite a few variables that come into play, including software, provider, codecs, and connection.

Google Voice Solutions:
GrooveIP: ($5.00)
MY Comments: not working reliably when off of Wi-Fi.

Review by cyberpyr8 (Verizon Network):

Talkatone: (Free) Routes Google Voice through their own servers. Apparently converts to 3 different codecs. See more here:
Comments: still testing

SIP Providers: Pay as you go, basically. DID numbers for $1/month, incoming calls $0.01/minute. Outgoing to the US starting at $0.0105/minute. They bill in 6 second intervals. You add funds (minimum $25), and they take them as needed. Supports G711(PCMA), G729a, and GSM codecs.
Comments: My current SIP provider. Interface seems fairly powerful when you get the hang of it. The 2 lower bandwidth codecs (G729a and GSM) seem to be fairly reliable, and G729 seems to be the better quality of the two. My WiFi calls have all been great, with very little lag time. Still testing.

ttabbal adds:
Anveo: I like the options, but the site is a little hard to get used to. It's also nearly impossible to get it to work reliably with Android directly. They are a good option for DIDs and general VOIP service though, if you have another service you can route Android calls to/from. DIDs are cheap here, US numbers seem to go about $2/mo with unlimited inbound calls. E911 is the cheapest I've found at $0.80/mo. Call quality seems quite good, though codec selection is somewhat limited. The call routing editor seems pretty cool. Flowchart looking design app for choosing what to do with calls. FAX is also an option for you business users. US calls are 1 cent per minute.

ttabbal adds:
Callcentric: They are a well known somewhat premium provider. I put $5 on them just as a backup route. They cost a little more, I think 1.5 cents/min. The gnex registers up to them fine, and calls in and out work fine. I've only used them a few times for testing, but call quality is good. Codec selection is in between. Enough options to cover most tastes though.

SIP apps:
Built-In SIP: (Free) Codec support is limited; no G729?

CSipSimple: (Free) Integrates into native dialer, lots of codec support. A lot of config options. Supports a ton of codecs. My current choice. NIGHTLY BUILDS HERE:

Bria: ($8.00) Quite a few options, but then they go and force you to pay even more for things like the G729 codec. Easy interface. I thought I had convinced myself I was getting better quality than CSipSimple, but I think that was related to outside variables. Does not integrate with native dialer.

Sipdroid: (Free) The original. Seems a bit dated now; no G729 support.

Skype: reported to work well, but is not the cheapest route. I haven't purchased one of their plans to test, but for easy setup it may be the best option. Proprietary codecs?

Terms for noobs: (Thanks ttabbal!)
DID: A phone number people on a regular phone can call. You can also direct Google Voice to call this number. If you have a free inbound call DID like Anveo, it's a decent option for GV integration. Most providers allow you to link a DID to various PBX type services and route calls in various ways. Or you can just send all the calls direct to your VOIP device.

PBX: Private Branch Exchange. Basically, your own mini phone company. You can receive calls, route them to various extensions (most any VOIP device), handle voicemail, transfer calls around, hold music, all sorts of crap most people here probably don't need.

Trunk: A connection for inbound and/or outbound calls. Usually used to link a server like Asterisk to a provider for calls to/from the phone network.

Asterisk: One thing Asterisk will give you is the ability to use a different codec on the phone->server link than the one GV uses. So your server will transcode for you. A free PBXes account will do that too. Asterisk is really more useful if you want multiple extensions and providers. You can then do all kinds of crazy stuff with calls.

Troubleshooting: (ttabbal again!)
NAT. NAT sucks. It will cause pain and suffering depending on the type of NAT you have. My office network is using Symmetric NAT, which is near impossible to use SIP with. So I set up OpenVPN on my gnex and just leave it running all the time. It doesn't use as much battery as I feared it would after tuning some settings. The big win was setting "keepalive 60 120" in the server config file. Comparing graphs using the Battery Monitor Widget, I'm about the same standby drain I was getting before. But now SIP works all the time, as there's no NAT in the way.

Wifi on the gnex.... When the screen is off it seems to go into some low-power state that doesn't save much power and causes little connection glitches. So even putting the phone to my head to talk would turn off the screen, then the VOIP call would get all choppy. Telling the app to leave the screen on in calls fixed it right up. I ended up trying Franco's kernel, as he has an option to disable the wifi power save stuff. It's working much better now. I've seen threads about this causing slow downloads when trying to download stuff like Gameloft game data as well. Though others say they don't see it. No idea, but it caused me lots of trouble and it's an easy fix, so I'm posting it.

UPDATE: New tips from natesilver:
Originally Posted by natesilver

1. Keep-alive.

This pretty much isn't important on wifi because a home router will usually keep the NAT entries long enough to never lose registration. However on 3/4G the cell carrier will usually cut UDP entries very quickly (my provider cuts them as early as 20 seconds. Unfortunately most VOIP providers only use UDP protocol. This means that if you are using the standard ICS VOIP client, you WILL miss some calls without even knowing that you have become unregistered.

There is an easy solution: go with a VOIP provider that supports TCP protocol. Why? Because cell carriers keep TCP connections open much longer. Personally, I'm very happy with even though they are UDP only. What i did was create a free account at (because they support TCP and allow free internet calls). My DID is then forwarded via sip uri to my free Sip2Sip account so i can always receive incoming calls while on mobile, for no extra cost than alone.
The other benefit to this is that now while using CSipSimple, you can change the TCP keep alive interval to a longer time (think 600 s), to allow the phone to be in deep sleep longer and greatly save on battery usage. IMO this if a must if you are using VOIP on a mobile connection for incoming calls.

The other topic is latency.
Even with a very fast wifi or mobile connection, there is noticeable latency introduced by the Android OS when using VOIP. The playback buffer seems to be unnecessarily high so there is a delay from the time the phone receives a word until it is played through the speaker. This makes for a bizarre pause during conversation, especially if two people begin to talk at the same time. Don't believe me? Try an echo test with your VOIP provider. On a good connection, you should hear yourself back essentially at the same time you speak. With stock Android, you will not experience this. There will be a delay. Add even a small bit of network latency and the problem multiplies.
I have a solution for you if you are using CM9 or AOKP or some other twist of these ROMs.
Install the patch from this thread:

Then to make it even better, use CSipSimple (nightly version) with OPENSL-ES enabled as backend implementation method for audio (somewhere in advanced media settings).
With this setup, latency is reduced to almost nothing which you can verify with another echo test, or just simply from the improved call conversation quality you will experience.

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5th April 2012, 09:14 AM |#2  
OP Senior Member
Flag Maui
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My 2 main requirements:
- Cheap. Trying to stay under $10/month, with an incoming 808 area code phone number.
- must be reliable enough to make and receive calls in most outdoor locations. Since I'm on an island, coverage is actually decent in most areas, but GrooveIP seems to be a bit too bandwidth intensive. Still testing with Talkatone, seems hit or miss. Low bandwidth codecs for SIP seem to be most reliable (as they should be) but you sometimes sound like a robot.

A few years ago, I had tried out Sipdroid back on my CDMA Hero with poor results, and abandoned my quest fairly quickly as I was on Sprint with plenty of minutes.

My interest renewed with the $30 T-Mobile Prepaid plan that gives 5gb of data but only 100 minutes. I don't need many minutes, but 100 isn't quite going to cut it. I'm still testing and will be updating this post and adding additional info as I try new solutions. I have not yet decided on a single solution.

My requirements are probably very different from most. I'm looking for it to play well with my prepaid ambitions. What I really wanted is to have Google Voice forward to my VOIP number and whatever prepaid number I was using that month. Google Voice is great, but I live in Hawaii, and the 808 area code is not eligible for Google Voice numbers. Can't get a new one, can't port one in.

While in many places this wouldn't be an issue, people take the 808 area code very seriously around here. If you are giving out your number for business reasons, it is a serious disadvantage if you do not have that 808, and you are looked at as an outsider. Stupid? Yes, especially when anyone can just pickup a $20 prepaid phone at Wal-Mart and have one, but it isn't something that will change soon.

My new plan is to use my VOIP number as my main number, and have any calls that go unanswered forward to the prepaid number. (EDIT: Just realized I could have this forward to a Google Voice # with any area code and maintain my 808 illusion... This might work!) interface allows for this, however you are charged both the incoming rate as well as the outgoing rate for all forwarded calls (about 2.5c per minute total for Hawaii). This is still cheaper than getting seperate forwarding number from somewhere like

As always, if anyone has any suggestions, please share.
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5th April 2012, 11:34 AM |#3  
Andie00's Avatar
Flag HCMC & Cali
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GVoice and Groove IP user here. I love it! I was using SipDroid with a SIP provider but it wasn't very reliable. Kept missing calls, etc. Never heard of Talkatone untill this thread. It seemed interesting so I looked them up but they display ads. No thank you. For a one time fee of $5 (I paid 2.50 as it's on special often) I recommend Groove. Use it on Wifi and 3G with no issues. I'm in Vietnam calling back home in SoCal.
5th April 2012, 12:33 PM |#4  
codesplice's Avatar
Senior Member
Flag Huntsville, AL, USA
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Great info. I've used GrooveIP extensively for about the past year and was over all quite pleased. The only issue I have with it is the lack of support for different (lower bandwidth) codecs. On wifi at my work, GrooveIP seems to really struggle at making calls clearly. That said, GrooveIP is far more configurable than the other straight Google Voice solution (Talkatone) and the extra configuration options are what kept me on GrooveIP for so long.

I've been using Talkatone for about the past week, and the calls have been much better - no more stuttering. Talkatone does display ads, which can be a bit of a turnoff. My other complaints about Talkatone were actually resolved in an update yesterday when they added the option to disable notifications for Google Talk messages and also an option to restrict to wifi. Now that those features are added, I went ahead and purchased a 1-year premium subscription for $20 which eliminates the ads and adds features - like the ability to automatically toggle your Google Voice settings based on your connection to the Talkatone service. It still has a few minor bugs but I'm sure those will be resolved soon.
5th April 2012, 01:43 PM |#5  
spencer88's Avatar
Senior Member
Flag Columbia, SC
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I bought GrooveIP when it went on sale a while back for $2 or $2.50. I only used it to make a few calls while on Verizon's 3G, worked rather well. I have talkatone but haven't used it yet but I hear good things about it.
5th April 2012, 02:09 PM |#6  
Q.Entity's Avatar
Senior Member
Flag Dallas
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I have been using Skype for ages. Most of the day my phone is on WiFi and I have the T-Mo 10GB plan so I am not concerned about the amount of data.

Most of the time, I do Skype to Skype so no cost there but I do need to do Skype to phone (mostly mobiles) from US to Europe.

Does anyone knows what gets me better rates than Skype on US to Europe (mobile)?
5th April 2012, 02:29 PM |#7  
Junior Member
Thanks Meter: 8
I am using the build in SIP client in combination with VoipAlot, which has very good rates both to landlines as mobile. I used to use Nimbuzz or Fring in the past in combination with VoipAlot, which also worked fine.
5th April 2012, 02:38 PM |#8  
Senior Member
Long Island, NY
Thanks Meter: 434
I been a GrooVe IP user for a while now. Whenever my phone is connected to wifi at work or home it goes into airplane mode w/ wifi enabled and changes my google voice # to forward to gtalk and use GrooVe IP.

Just downloaded Talkatone to give it a try to see which I like better. I like the fact that GrooVe IP was more integrated into android more (you don't have to use their app to make calls, or view call logs, ect). Hopefully Talkatone follows.
5th April 2012, 05:16 PM |#9  
Senior Member
Thanks Meter: 99
In my apartment, cell signal is rather poor for both AT&T and T-Mobile—as such, I can’t use the phone in most places in my apartment. Therefore, I looked into VoIP options and have currently settled on VOIPo ( and Internet calling using the stock firmware. This, in total and combined with T-Mobile’s prepaid 30USD/5GB plan gives me unlimited calling for under 40USD a month (though I had to pay VOIPo two years in advance to get this).

I am almost satisfied with this solution, but just barely.

  • I can call from anywhere in my apartment and call quality is better than cellular.
  • Unlimited minutes with 5GB of data for under 40USD
  • All voicemail comes in via email (but Google Voice does this as well)
  • Lots of call routing options (but I don’t really use these)

  • VOIPo only has one codec, which requires 80Kbps in both directions, so calls using anything less than a stellar 4G connection are quite poor or impossible (so I often need to make calls—or make the call again—using the 100 minutes available on the T-Mobile plan).
  • VOIPo’s BYOD servers appear to be less reliable than their non-BYOD ones
  • The Internet calling client appears to stop registering with the SIP server at least once a week, so I miss calls.
  • Fairly frequently callers complain of their voices being echoed back to them—and this seems to be more of an issue with the Internet calling client versus VOIPo, or some slight incompatibility between the two
  • I assume due to short NAT timeouts and possible packets loss, I need to configure the Internet calling client to Always Send keep-alive or I miss calls when on 3/4G—and I assume this also negatively affects battery life.
  • VOIPo does not do text messaging—so I have to make calls with one number and text with another

All said though, sadly it seems this stuff is still bleeding edge, even today (even though my legacy Nokia E51 does VoIP/SIP better than Google’s finest), and does not Just Work.
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5th April 2012, 05:59 PM |#10  
Senior Member
Thanks Meter: 38
Great thread. I'm on Verizon with only 50 minutes and unlimited data. Total is $50 a month.

I was using skype, but I am going to give voipalot a try.

Edit: Looks like voipalot does not update their ios and android apps very frequently. They also have pretty bad reviews. I guess I will look for another SIP provider.

Edit2: I decided to sign up for callcentric. Just added $5. Will report back.
5th April 2012, 07:54 PM |#11  
nomisunrider's Avatar
Senior Member
Flag Minnesota
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I use google voice and my own asterisk server at home for free VOIP whenever I'm on wifi.
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