Hi Anish ,
For Re-invite UAS can send 487 in the following case.
"A UAS core receiving a BYE request for an existing dialog MUST follow
the procedures of Section 12.2.2 to process the request. Once done,
the UAS SHOULD terminate the session (and therefore stop sending and
listening for media). The only case where it can elect not to are
multicast sessions, where participation is possible even if the other
participant in the dialog has terminated its involvement in the
session. Whether or not it ends its participation on the session,
the UAS core MUST generate a 2xx response to the BYE, and MUST pass
that to the server transaction for transmission.
The UAS MUST still respond to any pending requests received for that
dialog. It is RECOMMENDED that a 487 (Request Terminated) response
be generated to those pending requests."
INVITE
|--------------------------------------------->|
| 200 for invite |
|<---------------------------------------------|
| ACK |
|--------------------------------------------->|
| RE-INVITE |
|--------------------------------------------->|
| 18x for REinvite |
|<----------------------------------------------|
| BYE |
|--------------------------------------------->|
| 487 for Re INVITE |
|<---------------------------------------------|
| 200 for BYE |
|<---------------------------------------------|
| |
INVITE
|--------------------------------------------->|
| BYE |
|--------------------------------------------->|
| 487 for Re INVITE |
|<---------------------------------------------|
| 200 for BYE |
|<---------------------------------------------|
| |
But here BYE is treated as CANCEL.
Regards,
Thangarajan.
FlextronicsSoftware
(Worlds largest SIP stack vendor)
"Anish. T.
George"
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[Sip-implementors] Scenarios for
487 response
12/14/2005 10:52
AM
Hi ,
i would like to know that, Is there any Scenarios for which,
an invite can be responded with 487 "Request Cancelled".. ??
As my understanding, 487 can be received when the request is cancelled with
"CANCEL"
or invite requests expires if Expires header is present in INVITE request.
If i havnt added an Expires header and i dint cancell the request,
Is there any other scenario where i can get 487 for an INVITE request ??
looking forward for your valuable comments..
Thanks & rgds
Anish .T. George
Openera Technologies Pvt Ltd.
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