SIP/VoIP Media Parameters Synchronization
The SIP/VoIP Media Parameters Synchronization feature provides a way to maintain SIP signaling in synchronization with the parameters on the following cards:
• IP Network Interface Series 2
Prior to this feature, the IP Signaling Layer 3 protocol, SIP, maintained a locally cached copy of VoIP media parameters on a per-module basis. When the VoIP media cards are reconfigured through the Resource Attribute Configure (0x00E3) message, the local copy of configuration data maintained by SIP on the CSP Matrix Series 3 Card remains unchanged. In this way, the SIP and VoIP media parameters become unsynchronized.
The SIP stack needs to maintain an up-to-date, locally cached copy of VoIP media parameters in order to stay in synchronization with the VoIP media parameters.
In order to do so, the host application initiates the SIP stack configuration message, VoIP Protocol Configure (0x00EE) with the Resynchronize VoIP Media Parameters TLV (0x0284). This TLV enables the SIP stack to resynchronize with all the VoIP modules that have been previously cached by the SIP stack. For the details of this TLV, refer to the API Reference.
Below is an example of the VoIP Protocol Configure message with the Resynchronize VoIP Media Parameters TLV (0x0284) sent by the host application to ensure SIP and VoIP media parameter synchronization.
00 14 00 EE 00 00 FF 00 00 00 00 02 01 C8 00 01 04 02 84 00 01 01