Fast Start

Dave Walker dave_walker at Mitel.COM
Thu Mar 11 15:57:35 EST 1999

Hi Francois,

Have you checked the Implementors Guide from the 09/98 meeting?

For proposed alternative channels from called to calling,
alternatives have the same sessionId, mediaChannel (RTP
address), and mediaControlChannel (RTCP address).  A unique
fwdLCN is assigned to the chosen alternative by the called
endpoint and returned in the OLC which accepts the proposed

For proposed alternative channels from calling to called, the
mediaChannel is chosen by the called endpoint.  A unique fwdLCN
is assigned to each proposal (alternative or not) by the calling

In addition, all RTCP addresses proposed by the calling endpoint
for a given sessionId must be the same, regardless of the direction
of the logical channel.


Dave Walker
Mitel Corp.

Francois Audet wrote:
> Hi,
> Question on fastStart. When presenting different alternatives in the
> OpenLogicalChannel, the sessionID is the same for all, in order to
> distinguish between alternatives for the same session, instead
> of a proposal to open multiple media channels.
> Is the same valid for the RTP/RTCP port numbers, and the logical
> channel numbers? Do they have to be the same for alternative
> proposals, or can they be different?
> Any views?
> -----
> François Audet  Tel:+1 408 565 5675 mailto:audet at
> Nortel Networks Fax:+1 408 565 2375

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