SIP library for iOS with non-GPL license [closed]

Question

Are there any non-GPL SIP libraries/SDKs that'll let me implement SIP for iOS?

Answer 1

These are the ones I know about:

Proprietary:

• vaxvoip

Open source: GPL/LGPL

• sofia-sip
• linphone
• exosip

Answer 2

oSIP is LGPL and therefore can be used (as a library) in commercial and closed-source projects. It compiles easily for arm. It is the SIP library used by linphone for iPhone; however, linphone is GPL.