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RE: VS: VS: [Sipping] FW: I-DACTION:draft-sawada-sipping-sip-offeranswer-01.txt (Comments 4 to 6)
Hi,
>>>If, after A had been put on hold it decided to initiate its own hold
>>>action (perhaps because another call was received), then when the
>>>reinvite is received it might indeed specify SENDONLY. That wouldn't
be what the
>>>sender of the reinvite wants to hear, but it is the current
situation.(Of course
>>>when A decided to do it own hold it probably should have done its own
>>>reinvite specifying INACTIVE.)
>>Ok, so what is the "desire" of an MGC (or any other entity without
>>direct user control)? How does an MGC know whether he "wants" to be on
>>hold or not?
>>
>It needs to figure it out based on interactions with the other side.
I am not sure I understand. What other side? And what interactions? Do
you mean, in case of an ISUP/SIP MGC, the ISUP side, and ISUP
interactions?
>For a "regular" UA, I think a reasonable way to make the determination
is based on whether the media stream(s) are
>connected to a primary local source, sink, or both, or neither. I think
the same works for an MGC.
I am not sure I understand, but HOW would the MGC know that? All it has
is a remote SDP...
>Signaling on the non-sip side might influence this state.
In the SIP/ISUP case that won't help, because there will be no ISUP
signalling.
Yes, IF the MGC decides to change the hold state it may send a CPG
towards ISUP, but first it would need to decided whether to change that
hold state in the first place...
Chris, I appologize if I remember wrong, but didn't you at one point
have strong opinions on how an SDP offer to an empty re-INVITE should
look like?
Regards,
Christer
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