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New Member

device pool and h323 gateway settings


I am reading up on the H323 gateway configuration where you define a device pool to the gateway. What parameters are used in the device pool.

1. Call manager groups is this telling the call managers which server will the primary to contact the gateway and if it looses contact which will be the backup to route calls to the gateway

2. What is the region used for, is it used simply for the Config of the other devices say a phone to be able to point to the gateway and specify what bandwidth it wants to use to the gateway. In the reverse direction the region on the gateway to say a phone defines a codec however the gateway is configured statically with the code, in this direction does it simply act as a check for when the received H245 negotiation takes place


Re: device pool and h323 gateway settings

H323 gateways doesnt register with callmanager, so the group setting in the device pool is irrelevant, even though device pool require the CMgroup as a mandatory setting. The key items within a device pool that are going to affect a gateway are

a. Region setting. When a call comes in from this gateway to a phone that falls in a different region, then the codec setting between the gateway and the phone's region determines the bandwidth used for the call between the two.

b. MRGL - This list determines what type of resources are accessible to the gateway. If PSTN callers need to hear MOH, make sure an MRGL is specified at the gateway or device pool level.



New Member

Re: device pool and h323 gateway settings

Many thanks this makes sense.

So for a gateway in say region 1 using g711 to talk to region 2 and if it is setup in its dial peer to talk g729 and phone 1 has region 2 g729 to talk to region 1 will the call manager try to negotiate with the gateway to use G729 or will it simply talk to gateway using G711 knowing that this is what is setup in the region and setup a transcoder in the middle between the two.

If you could maybe give an example and the flow would very helpul.


Re: device pool and h323 gateway settings

CCM Group in an H323 GW is very important in terms of H225D process which will accept or not H323 connections in the server which is active. When you add an H323 GW in CCM a H225D instance will be created in each CCM of the CCM group of that GW. That will permit to accept or not H225 sessions.

New Member

Re: device pool and h323 gateway settings

Thanks for that so it creates an instance on the two call managers which will accept the inbound calls, does this mean if the primary is up and you setup the dial peer to the backup call manager will reject the call.

Also for outbound calls to the h323 gateway does it mean the primary will be the one to send the outbound calls and if it looses contact to the gateway the backup call manager will make the outbound calls.