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RFC 4353: 1. SIP is a signaling protocol can run on UDP or TCP, if...

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Comment by lakshmana chintada
Submitted on 2/10/2006
Related RFC: RFC 4353
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1. SIP is a signaling protocol can run on UDP or TCP, if it utilizes UDP as transport protocol, SIP signaling does not exchange a kind of message after call establishment. This results another set of problem to packet classifier. During the media flow packet classifier see no packets , this will results in unnecessary flow tear down. So SIP signaling should allow some kind of ping messages during the media flow to keep the signaling channels. If it over TCP then there should not be a problem because TCP has keep alive messages.