Re: Error: ACK without matching transaction

According to  transaction description at
https://datatracker.ietf.org/doc/html/rfc3261#section-6
ACK is a separate transaction in case of successful reply to invite.

It isn't clear from your messages what kind of response your ACK
acknowledges.

On Wed, Aug 27, 2025, 00:59 Fernando Lopes via sr-users <
[email protected]> wrote:

> 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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