[SIPForum-discussion] 481 call leg/transaction does not exists

Amit Ranjan Sahu amitranjansahu at gmail.com
Tue Jun 21 06:16:03 UTC 2011

Hi Raghul ,

No sip device cant recieve 481 for ACK sent for 200 OK .

As per RFC 3261 -
21.4.19 481 Call/Transaction Does Not Exist
  This status indicates that the UAS received a request that does not
   match any existing dialog or transaction.

SIP transaction consists of a single request and any responses to
   that request, which include zero or more provisional responses and
   one or more final responses.  In the case of a transaction where the
   request was an INVITE (known as an INVITE transaction), the
   transaction also includes the ACK only if the final response was not
   a 2xx response.  If the response was a 2xx, the ACK is not considered
   part of the transaction

Here the ACK is it self a transaction . So its unique transaction.

Amit Ranjan Sahu
On Sun, Jun 19, 2011 at 2:53 AM, Raghul Prasanna <raghul82 at yahoo.co.uk>wrote:

>   Hello all,
> Can a sip device receive 481 call leg/transaction does not exists for the
> ACK message it sent in response to a 200 OK? Please explain.
> Thanks,
> Raghul
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