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    <p>You don't have to send the registration more often. You can do something like this: configure your server to send keep alive packages to your sip client in order to keep the TCP connection open. Your server should support TCP connection and your client should communicate over TCP since apple is very restrictive in background mode and only the TCP connection is allowed to remain open in the background (if your TCP socket is wrapped with CFReadStreamRef).</p> <p>The problem is no the registration message, this can be configured by the client by specifying the time between the connection attempts, and the sip sever will be fine with an interval of one hour between 2 registration messages. The real problem is how will the server contact the sip client in case of an incoming call or IM. Most of the sip clients will not have a public IP adress but most probably they will be behind a NAT. So there is no way the sip server can open a direct connection to the sip client, for this reason you have to keep a socket open between your client and the server.</p> <p>None of the app in the appstore is sending registration message more often than 600s.</p> <p>Do you use your own library for sip or you use pjsip? If you use pjsip i can give you more hints. What SIP server do you plan to use?</p> <p>Some hints: </p> <ul> <li><p>make sure you set in your app-info.plist the required background modes to "App provides Voice over IP services" and "App plays audio"</p></li> <li><p>in case your app will not be tied to your own sip server then provide a way for the user to disable the allow_contact_rewrite pjsip param (usually u want this to be enable for bypassing the nat problem) since some session border controllers are not happy about this feature</p></li> <li><p>make sure, in case you capture the messages send form the sip thread in your main thread, you are using a method to post them in the main thread</p></li> <li><p><a href="http://trac.pjsip.org/repos/wiki/IPAddressChange" rel="nofollow">here</a> are described some other interesting issues</p></li> <li><p>have a lot of coffee prepared :))</p></li> </ul>
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    1. POKeeping SIP registration alive for interval less than 600 seconds in iPhone VOIP app
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    1. COYes, I use pjsip. Please give me more hints.
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      1. USDarshan Prajapati
    2. COAnd I will use any SIP server which complies with standards of SIP RFC.
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      1. USDarshan Prajapati
    3. COHey Alinoz, are you there? Please give me your hints.
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