3 Jan
2007
3 Jan
'07
4:49 a.m.
KOK FOON YEW wrote:
This is pertaining to call cancel operation where the
calling UA sends a CANCEL request via openser to the called UA.
After the UA sends ACK in response to 487 Transaction Terminated response, 487 responses
are re-transmitted by openser to the UA as if the SIP proxy didn't regcognise the ACK
request. I have tested with other UA and compare the differences between the ACK sent by
UA that worked and UA which has this problem. The difference is that the ACK sent by the
UA having this problem has a route header added.
Hi!
According to RFC 3261 the CANCEL must be identical to the INVITE - thus
if the INVITE does not have a route header, the CANCEL must not have a
Route header.
regards
klaus
Foon-Yew Kok
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Klaus Darilion
nic.at