Thanks you very much for your reply. That's what I was looking for.

From: sr-users-bounces@lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Muhammad Shahzad
Sent: Monday, January 20, 2014 1:32 PM
To: Kamailio (SER) - Users Mailing List
Cc: daniel@asipto.com
Subject: Re: [SR-Users] Development of a Mobile VOIP app connecting to Kamailio Server

This is kamailio forum and as you mentioned all is working on kamailio side. Any standard SIP client should work with kamailio without any problem, regardless if its a mobile app or desktop softphone or even an ATA.

Regarding SIP client SDK for mobile apps, there are several available, both commercial and opensource. A few examples below,

http://www.pjsip.org/
http://doubango.org/
http://plivo.com/voip-sdk/
http://www.acrobits.cz/27/acrobits-mobile-voip-solutions
http://www.linphone.org/eng/documentation/dev/liblinphone-free-sip-voip-sdk.html

Thank you.