Error: ACK without matching transaction

Fernando Lopes via sr-users <[email protected]>
Newsgroups gmane.comp.voip.ser
Message-ID <[email protected]>
Hello everyone,

Quick question: I have a t_check_trans that is returning false even though the ACK should match a SIP message. 

Here are my logs:

INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/WSS hruuc8uql46h.invalid;branch=z9hG4bK9771396
To: <sip:[email protected]>
From: "916c67e8-652f-49ea-b288-2bbbee8dbf21" <sip:[email protected]>;tag=cv63sqfvns
CSeq: 2 INVITE
Call-ID: pr0ndrr8fd14vekv6k15
Max-Forwards: 70
Authorization: Digest algorithm=MD5, username="User1", realm="XXXXXX", nonce="1756247832/9dfac95b19496304d744138c5789346f", uri="sip:[email protected]", response="8abe90b7e0971cc52ce0a2c6988e0656", opaque="370804d3544dc2aa", qop=auth, cnonce="im9losvhkh93", nc=00000001
Contact: <sip:[email protected];transport=ws;ob>
Allow: ACK,CANCEL,INVITE,MESSAGE,BYE,OPTIONS,INFO,NOTIFY,REFER
Supported: outbound
User-Agent: SIP.js/0.21.1
Content-Type: application/sdp
Content-Length: 2545

ACK sip:10.5.0.2:5060 SIP/2.0
Via: SIP/2.0/WSS hruuc8uql46h.invalid;branch=z9hG4bK6675132
To: <sip:[email protected]>;tag=b51c9e70-e71d-4a52-a8a3-07673119e625
From: "916c67e8-652f-49ea-b288-2bbbee8dbf21" <sip:[email protected]>;tag=cv63sqfvns
CSeq: 2 ACK
Call-ID: pr0ndrr8fd14vekv6k15
Max-Forwards: 70
Supported: outbound
User-Agent: SIP.js/0.21.1
Content-Length: 0

Thank you.
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