If you don't include the transport= in the message, the reply to that register should still go back on tcp, but the calls to that registered endpoint will go on upd. Mike On Apr 24, 2009, at 6:19 AM, Mikael Aleksander Bjerkeland wrote:
Hi,
I'm registering a Nokia N82 with FreeSWITCH, where the hostname has NAPTR and SRV records pointing to the server in the following order: TLS, TCP and UDP.
If I set my Nokia phone to use transport type: Auto it registers to FS with TCP, but it doesn't have transport=TCP in the Contact header. FS receives SIP messages from the phone in TCP but replies in UDP due to the Contact missing transport=TCP. The phone doesn't acknowledge any UDP traffic since it initially registered with TCP.
If I change transport type to either TCP or UDP things start to work as the phone adds the appropriate ;transport= tag. Is this the expected behaviour? Is FS or the phone doing something wrong here? Should a UAS assume transport=TCP if the initial traffic (REGISTER) is TCP and the transport= tag is missing?