Howto:SIP resource allocation

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Revision as of 11:34, 6 July 2007 by Tac (talk | contribs) (New page: ==Message allocations== When using UDP as transport protocol for SIP signaling, the SIP user agent (UAC/UAS) is responsible for retransmission in case of packet loss. For this reason the ...)
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Message allocations

When using UDP as transport protocol for SIP signaling, the SIP user agent (UAC/UAS) is responsible for retransmission in case of packet loss.

For this reason the user agent has to keep transmitted messages (requests or resopnses) to be able to do a re-transmission, in case the remote user agent receive this message. The user agent is obligated to keep transmitted messages for about 32 seconds. (Refer to: RFC-3261 "SIP: Session Initiation Protocol")

For every non-INVITE transaction the user agent has to saves the request and the final response (2 message allocations). For every INVITE transaction the user agent has to saves the request, the final response and the ACK (3 message allocations). Our SIP implementation allocates 2KB memory for every single message.

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