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

Tomasz Karbowski tom170 at o2.pl
Tue Jun 21 06:08:26 UTC 2011

Dear Raghul,
I think it's possible when the SIP server send an ACK message to your  
device with wrong call-id (error of server, unspecified error).
Then your device will send back 481 call leg/transaction does not exists.

This can also happen in callback services for ex. when leg B answer the  
call when leg A still is ringing.
Then Leg B drops the call and when leg A pickups it will send wrong  
messages to Leg B and get 481.

Best regards,

Dnia 18-06-2011 o 23:23:51 Raghul Prasanna <raghul82 at yahoo.co.uk>  

> 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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