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[MEDIACTRL] Direct Phone Call Call-Flow
Hi,
I have been studying
the mediactrl drafts lately and I have the following
question.
Is the scenario described
below for a direct phone call valid from the mediactrl framework
perspective? This scenario is based on the call flow presented in the
draft-ietf-mediactrl-call-flows-01 draft from chapter 6.2.1 Direct
Connection.
1) AS requests MS to create a media connection for UAC1 using SIP
Signaling.
2) MS allocates resources for
the UAC1 connection on one DSP device.
3) AS requests MS to create a media connection for UAC2 using SIP
Signaling.
4) MS allocates resources for
the UAC2 connection on another DSP device (e.g. there is no room left
on the previous DSP).
5) AS requests MS to join
UAC1 connection with UAC2 connection using the Control
Channel.
6) MS can join the
connections only if they are located on the same DSP. By reducing the internal
media traffic between two DSP devices the I/O processing on the DSP is
also reduced thus allowing more external media streams to be handled with
the same processing power. So MS decides to move the media connection of UAC1 to
the second DSP. In this case the media IP Address and/or the UDP port for the
UAC1 connection will change. MS needs to inform AS of this change by
sending a re-INVITE.
Once the
re-Invite is accepted by AS, MS will join the two connections and acknowledge
the Join command on the Control Channel.
If this is a valid
scenario, should it be specified in the standards that the MS can renegotiate
the connection settings (maybe also codecs?) after a media connection
was already created?
Thank you in
advance,
Andreea
Rusu