Hello,

Freeswitch for some reason ignores UA's ACK and keeps re-transmitting 483 response (as per attached example). I suspect dialogue mismatch, but don't see anything abnormal in the ACK. From: To: and Call-ID: all match!

Could someone with good eyes help find what makes FS unhappy about the ACK? Enabling debug output did not not reveal anything (FS does not print any debug output when receiving the ACK).

SIP call flow:
UA     --INVITE-->         FS
UA     <--100 Trying --   FS
UA     <--483--             FS
UA     --ACK-->             FS
And here is what I don't like:
UA     <--483--             FS
UA     <--483--             FS
UA     <--483--             FS
....


UA is my SIPp that's set to ping FS with INVITE and expects 483 in response (or any rejection that I like). This is needed to monitor call processing (FS uses mod_lcr to return error channel like 483, so this will allow me to ping mod_sofia as well as mod_lcr).

Any help is appreciated.

Thank you,
Victor

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