Martin
Guest
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 Posted:
Sat Nov 12, 2005 4:21 pm Post subject:
H.323: How to restart OLC,TCS,MSD? |
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Hello,
I got a question for the H.323 protocol experts.
A Gatekeeper (GK) within a Pstn gateway is sending H.245 "empty
terminal capability set" (tcs0) towards two H.323 endpoints, in order
to instruct them to close their logical channels. The GK is also
closing its forward channels. So far so good.
What is the latest recommended way in H.323 to go for the GK to
instruct the two endpoints, that they should restart negotiating
OpenLogicalChannels, TerminalCapabilities and the MasterSlave
determination?
The actual intent is to connect the two media streams of the involved
endpoints together. Regular H.450.2 (Call Transfer) cannot be applied,
because the situation occurs in an h.323--pstn interworking scenario
and must be settled otherwise.
Thanks,
Martin |
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Andreas Sikkema
Guest
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| Posted:
Mon Nov 14, 2005 4:11 am Post subject:
Re: H.323: How to restart OLC,TCS,MSD? |
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On Sat, 12 Nov 2005 02:21:19 -0800, Martin wrote:
| Quote: | A Gatekeeper (GK) within a Pstn gateway is sending H.245 "empty terminal
capability set" (tcs0) towards two H.323 endpoints, in order to instruct
them to close their logical channels. The GK is also closing its forward
channels. So far so good.
What is the latest recommended way in H.323 to go for the GK to instruct
the two endpoints, that they should restart negotiating
OpenLogicalChannels, TerminalCapabilities and the MasterSlave
determination?
|
Once upon a time when I was still working with H.323 we did this by
sending the "sendTerminalCapapbilitySet" message to one (or both? I don't
remember) sides of the conversation. The state machines in the stacks of
the time (ca 2002) weren't very sophisticated so when they received a new
TCS, they just continued as if this all was the start of a new
conversation.
I have _no_ idea what the recommended way is of today...
--
Andreas Sikkema |
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