Offnet to Offnet Transfer, CUCM 7.02

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Sep 20th, 2010
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Hi all, I have a problem with offnet to offnet transfer but only when I call an external number (CUCM 7.02). The parameter offnet to offnet block is set on "false".

If someone (from extern) call me and I want to transfer to another external phone all work correct.

But if I call an external number and I want to transfer this, the call are dropped when I try to connect the external phone.

When I change the "Call Classification" to "Onnet" (on the H323 Gateway), the offnet-offnet transfer is working. Unfortunately all calls through

this device are not labeled "offnet" anymore and the "Forward No Answer External" won't work.

Activating the "Media Termination Point Required" would solve the problem, but all calls are transferd through the gateway.

Thanks for a hint.

Greets, Norbert

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Lakshmi Adapala Fri, 09/24/2010 - 13:53
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Are you using the same gateway for both inbound and outbound PSTN calls ?

1)  For inbound calls , the device-level configuration or the corresponding Call Classification service parameter value determines the offnet or onnet value. So seem like it was seeing this as onnet and you can transfer to an offnet when someone calls you (onnet <--> offnet)

2) For outbound calls , the Call Classification setting in the Route Pattern Configuration window determines the offnet or onnet value and the Call Classification value in the Route Pattern Configuration window overrides the device-level configuration or the corresponding value of the Call Classification service parameter. But if you are able to get this working by changing the device level (H323) setting to onnet , seems like this device setting is overriding the setting at the route pattern level.

So do you have "Allow Device Override" parameter checked ?

3) There are 2 service parameters that are related to onNet/offNet operations.  One is the "Block offNet to offNet transfer" setting.  The other is "Call Classification" within "Clusterwide Parameter  (Device General)", if you don't have anything on the device it applies this.  So for outbound calls you can set the offnet setting at the route pattern level and leave device override unchecked, regardless the transfer shouldn't be blocked by cucm if the service parameter is set to false. So during offhours or on your lab cucm cluster you can try retstarting the CCM service to make sure that this service parameter setting has taken in to effect.

Before this you might want to pull traces and check the call clasifcation and blocked reasons and confirm if this SP value is being ignored.

alig.norbert Fri, 09/24/2010 - 15:39
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Thank you for the reply.

The gateway is used for in/oubound PSTN calls.

I'll check the other settings and get you a feedback



rpomerleau Tue, 09/28/2010 - 16:57
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Aliq, Did you get this resolved? I am having a similar problem.


alig.norbert Tue, 12/28/2010 - 07:26
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had finally time to get some test ;-)

When changing the "Call Classification" to OnNet and the PSTN-Gateway to OffNet the transfer is working through the same PSTN-Gateway.

But the remote office is doing offnet calls through the SRST/PSTN on site, only several calls (e.g. calls to employes mobiles) are terminated on the

mainsite PSTN-Gateway. With this scenario, I still have the transfer issue (first call build up through GW on the remote-site, the second one through the mainsite GW).

I suppose, the only solution is the MTP.




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