[asterisk-users] OT: Which SIP method to use for this specific behaviour ?

[Olivier]

Hello,

Let SIP extensions 1001 and 1002 belong to an Asterisk calling group :
whenever an coming call reaches this calling group, both extensions 1001 and
1002 receive a SIP INVITE message which makes these 2 phones starting to
ring.

When a callee picks up his phone, the other extension receives a CANCEL or
BYE message which stops ringing.

Is there any option you can include in CANCEL or BYE messages so that the
SIP hardphones would understand it shouldn't have to log this call as it has
been replied by someone else ?

In other words, is there any Alert-info option which can be used to pilot
phones call history logs  ?
I didn't dare to search myself in IETF archives, given the number of
standards, SIP is now including.

Regards
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