Hi *,

Few queries on transport protocol to be used within the SIP dialog:


*         Is it acceptable to change the transport protocol (tcp, udp,..) for a 
new request within a SIP dialog? Assuming that the new request within the SIP 
dialog has size more than 1300 bytes and need to use TCP as transport protocol?

*         In case, if a SIP entity want to force UDP protocol to be used always 
for all messages within a SIP dialog, should it need to set the transport 
parameter in the Contact Header as "UDP"?

*         Will it be possible to use UDP protocol only between 2 SIP entities 
for all messages across dialogs? Is there a possibility to negotiate this 
transport parameter beforehand between 2 entities (via OPTIONS ?) ?

Please provide your valuable comments.

Thanks,
kumar

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