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<concept xml:lang="en" id="GUID-53017B71-9399-548B-BD1D-C68FC535A543"><title>SIP Timers</title><prolog><metadata><keywords/></metadata></prolog><conbody><section><title>SIP transaction timers</title> <p>SIP transaction (SIP T) timers T1, T2 and T4 can be configured as per the bearer type. The default SIP T timer values for GPRS bearer are 3, 16 and 17secs. The default SIP T timer values,for WLAN is 500ms, 4secs and 5secs. The read operation on SIP T timers is <i>alwayspass</i> and write operation requires <i>writedevicedata</i> capability. </p> <p>The central repository keys for SIP T timers and its CenRep UIDs are as follows: </p> <codeblock id="GUID-5FE5A016-F24B-5E49-AC60-A4502307740F" xml:space="preserve">
// SIP stack Configuration parameters.
const TUid KCRUidSIP = { 0x101FED88 };

// SIP transaction timers for GPRS bearer in milliseconds as per RFC3261.
// For SIP T timer T1 
const TUint32 KSIPTransactionTimerLANT1 = 0x01;

// For SIP T timer T2 
const TUint32 KSIPTransactionTimerLANT2 = 0x02;

// For SIP T timer T4 
const TUint32 KSIPTransactionTimerLANT4 = 0x03;

//SIP transaction timers for LAN  bearer in milliseconds as per RFC3261.
// For SIP T timer T1 
const TUint32 KSIPTransactionTimerLANT1 = 0x0b;

// For SIP T timer T2
const TUint32 KSIPTransactionTimerLANT2 = 0x0c;

// For SIP T timer T4
const TUint32 KSIPTransactionTimerLANT4 = 0x0d;</codeblock> </section> </conbody></concept>