[asterisk-users] Redirect a GSM call through Wifi to a SIP phone

A J Stiles asterisk_list at earthshod.co.uk
Fri Nov 1 12:02:57 CDT 2013

On Friday 01 November 2013, Sil wrote:
> I want to know if it's possible to use a mobile phone application for
> redirect automatically incoming calls of a GSM phone connected to Wifi
> network to a Sip phone.
> I've try to use different mobile phones SIP clients without any success.
> No one of them can redirect calls automatically. I've got Android and
> BlackBerry phones.

What you want is not just a SIP client; it also has to integrate with the 
phone's own GSM stack.

You probably will have the most success with Android, because you are going to 
need well-documented Source Code to stand a chance of getting anywhere.  You 
will need an Open Source SIP client and the Source Code for the stock Android 
GSM telephony app.  You then will have to bodge the two together somehow .....

Actually, as long as the data packets coming from Android GSM phone are 
already compressed using the GSM codec, you shouldn't have to do anything to 
them to re-send them out over SIP; and similarly for packets arriving by the 
SIP connection to re-send over GSM.

This really is not going to be a trivial project.  Good luck with it -- you're 
going to need it  :)


Answers come *after* questions.

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