9 Jul
2022
9 Jul
'22
9:32 a.m.
According [RFC3261](https://datatracker.ietf.org/doc/html/rfc3261#section-19.1.2)
The default transport is scheme dependent. For sip:, it is UDP.
For sips:, it is TCP.
According to the OPTIONS message above, Kamailio tries to use UDP transport for "sips" schema. Another approach, as a workaround, update the Contac header and add "transport=tcp" when using "sips" schema.
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