Any recommendation for an Android VOIP app?

There seems to be many around.

Have a VOIP account already which can have multiple devices (Home device, Mobile, Computers...) upto 7 per number and upto 3 numbers per account.

i use sipdroid. it worked, so didn't try others.

sipdroid works.

but CSIPsimple works better.
they are both free, so download and try them out - see which one you prefer...

Great, thanks will give them a try.

Do you know how much bandwidth needs?
How much can you call with 300MB?

Thanks

Is netvoip compatible with any Internet connection?


netvoip lets you make phone calls from any broadband Internet connection with at least 100 kbps upload and download. If you want to make two calls at the same time, we recommend a connection of at least 200 kbit upload and download.

https://www.netvoip.ch/support

YOu should only be charged for hte data tha is transmitted. Can also be used over wireless.

Installed CSIPsimple, and setup my account on there but says forbidden. Not sure if this is Swisscom issue or the provider. Will have to investigate further. Was trying his with a wireless connection with data over 3G turned off.

if you are using wifi then Swisscom does not enter the equation.. so it must be something else.

unless your phone is locked to Swisscom. Typically when providers give you a phone with a contract, they customize the Android interface and restrict what you can install or do..

I would not realistically expect much out of voip with a limited data connection like that.
200kbps works out to roughly 1.5MB per minute (can someone check my calculation?)

you will do much better by using voip only when you have wi-fi access.

So far I've been so happy with sipdroid that I didn't bother to try something else.

What are the àdvantages of CSIPsimple over sipdroid?

I remeber reading someone checked the throughput for a call and was about 30k but I guess they quote higher numbers to ensure a good service. Also I guess you only pay for the packets/data you transmit/receive.

Can I also have a number along with the app so that people can call me from regular phones?

You need to signup to a VOIP service.

200kbps/8 x 60sec = 1.5MB

Looks ok to me.
But it really depends on what codec you are using. G.711 is the "default" VOIP codec that just about every VOIP phone supports, it's 64kbps, but I think I measured it to be less actually. Altho technically you should have a 100kbps connection for it.

If you are using VOIP over a mobile phone network, try switching to the GSM codec, that is also a common codec and uses only 13kbps. Using VOIP over cellular networks is generally hit-and-miss tho. You need a good connection. And sometimes the RTP stream gets blocked for some reason, and you can ring someone but then have no, or only one-way audio. If you use wifi, you generally don't have these kind of problems.

Have a look here for more info on codecs:
http://radioraiders.com/voip-codecs.html

PS- Sunrise says they are now specifically blocking VOIP on their network.

been using voipbuster and easycallback for a good 1.5 years now over 3g on my htc (desire and now desire hd).

I am using VOIP with Sunrise surf option. It works well.