H.323's "keepAlive" mechanism
Chris Wayman Purvis
cwp at ISDN-COMMS.CO.UK
Mon Jan 29 10:07:33 EST 2001
> According to the text in section 7.2.2.1 of H.323v4 (11/2000), as a response
> to a RRQ, a GK may respond with an RCF containing a timeToLive that is equal to
> or less than the timeToLive from the RRQ. This raises two questions:
>
> 1) Why isn't it allowed for a GK to respond with a greater value, or any value for
> that matter?
There's no point. After all, the endpoint is permitted to renew its
registration earlier than necessary, so if the gatekeeper put in a longer
timeToLive an endpoint would not lose by (and probably would) use its preferred
value anyway.
> 2) If the EP does not specify a timeToLive, should this be treated as a value
> of "0" and does this make it impossible for a GK to impose any timeToLive
> value?
I would suggest that this would imply that the endpoint does not support this
feature. I would, on the other hand, have thought (unless one of the standards
says otherwise) that a value of "0" would mean that the registration expires
immediately, which may not be terribly useful! Not quite the same thing.
Regards,
Chris
--
Dr Chris Purvis -- Development Manager
ISDN Communications Ltd, The Stable Block, Ronans, Chavey Down Road
Winkfield Row, Berkshire. RG42 6LY ENGLAND
Phone: +44 1344 899 007
Fax: +44 1344 899 001
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