Kapil Nayar wrote:
> Hi Paul
>
> Glad you corrected me!
> I was specific (not generic) about Call Hold since
> some SIP experts in my neighbourhood were of a view
> that many service providers donot support changing
> codecs when putting a call ON/ OFF Hold in the same
> Re-Invite.
> Although, this is acceptable as per the standards,
> Service Provider support would be crutial for the
> implementors.
YMMV. If you think you will encounter implementations with a restriction
like this, then you may want to ensure you never request such a
concurrent change, while still being prepared to deal with one offered
to you.
Paul
> But, from your statement it seems it is likely to be
> supported.
>
> thanks,
> -kapil
>
> --- Paul Kyzivat <[EMAIL PROTECTED]> wrote:
>
>>
>> Kapil Nayar wrote:
>>> Hi
>>>
>>> The SDP/ SIP standards donot restrict the Call
>> Hold
>>> ON/ OFF (ReInvite with mode sendonly) and Codec
>>> renegotiation (ReInvite with a different codec
>> list)
>>> to be combined in the same transaction (ReInvite
>> with
>>> mode sendonly and different codec list).
>>> Are there any restrictions/ limitations in doing
>> this?
>>> Do most implementations accept/ initiate this
>>> behavior?
>> You are asking if it is permissible to change the
>> directionality
>> (sendonly, sendrecv, readonly, inactive) of a media
>> stream and the
>> codecs in a single offer/answer?
>>
>> Yes - its fine to do that.
>>
>> The way you phrase the question suggests you
>> consider the directionality
>> attributes to simply be a way of communicating the
>> Call Hold feature.
>> While the directionality attributes can be used to
>> indicate a desired
>> state due to placing the call on hold, they can also
>> be used for other
>> purposes.
>>
>> Paul
>>
>
>
>
>
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