[cisco-voip] Monitoring H323 Trunk Status

[Wes Sisk]

Inline, ws.

On 3/3/2011 12:42 PM, James.Brown at barclayswealth.com wrote:
> All,
>
> Does anyone know whether it is possible to monitor the status of a Non-GK controlled H323 trunk please?
ws: what are looking to monitor?  If non-GK controlled then there really 
isn't anything that remains active that is externally observable.  The 
thread remains active in the cm process but there's not real visibility 
into that.
> I'm thinking of this in the context of a trunk out to a Rightfax server. I'm not sure whether these trunks hold a TCP connection open
ws: nope, TCP session is established per-call. CUCM still does not 
support tunneling. Tunneling would allow multiple h225/h245 sessions on 
a single TCP session. IOS has this but not CM.
> or send any keepalives.
ws: keepalives are exchanged for active calls based on a service 
parameter. For some history see:
CSCsq17141    CUCM - Allow TCP KeepAlives for H.323 should enable H.245 
TCP KAs also
>   Incidentally, does an H323 Gateway device behave any differently from a trunk in this respect?
ws: There are subtle differences.  CM sends out custom information over 
h323 trunk that is not sent over h323 gateway.  That custom information 
is sent using standard h323 extensions.  If an endpoint does not use a 
fully compliant stack it may fail to parse the extension elements.  
Using an h323 gateway avoids sending those elements.  There may be other 
subtle differences as well.
> Many thanks in advance.
>
> Regards
>
> James.
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