The UDP switch made the watch register over UDP while Asterisk had
cached a TCP Contact (transport=tcp). Asterisk sent the INVITE over
TCP but got no SIP response (not even 100 Trying) -> 6.4s
retransmission timeout -> immediate voicemail.
Revert to TCP so the watch's registration matches Asterisk's cached
contact. With nat=yes now set, the TCP Contact is made public
(78.141.29.181:<port>), so the INVITE arrives over the persistent TCP
socket and baresip's response reaches Asterisk, letting the call ring
the full configured window instead of timing out.
jamie prince
300bdcc810