Pjsip trunk to grandstream UCM


I have configured a pjsip trunk but when I forward a call I get this error:

[2020-03-31 08:44:37] ERROR [1413]: pjproject : <?> : sip_transport. Error processing 434 bytes packet from UDP : PJSIP syntax error exception when parsing ‘Request Line’ header on line 1 col 3:
SI?2.0 404 Not Found

Can someone please help me?
Thanks in advance

Try restarting Asterisk with fwconsole restart.

thank you. I tried but got the same error

Then you need to investigate your SIP signalling. Enable pjsip set logger host x.x.x.x and see what is going on. Alternatively you can use sngrep

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