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If the network connection to CUCM is down, if the E1 interface on MGCP...

Cisco CallManager, Cisco CallManager Express and IP Video

If the network connection to CUCM is down, if the E1 interface on MGCP...

Postby Guest » Tue Nov 09, 2010 7:33 pm

Hi,

 

I have a question here.

 

We have two MGCP voice gateway routers configured on CUCM 7. If the network connection between the primary MGCP voice router and CUCM servers is broken, we notice that the status of the primary MGCP gateway on CUCM is unregistered, but the E1 internface PSTN circuit on that rouer is still up. This causes an issue that Telco carrier still sends incoming calls to PSTN link on the primary MGCP gateway router, not the backup MGCP gateway router which still registers with CUCM server. As a result, incoming calls just termiate on the primary MGCP router and cannot go anywhere.

 

I would like to know when primary MGCP gateway router loses connection to CUCM servers, if it is possible to for the MGCP router to bring down the E1 internface, which can let Telco carrier starts sending incoming calls to the backup MGCP gateway router.

 

Thanks

Bob

Guest
 

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Re:If the network connection to CUCM is down, if the E1 interface on MGCP...

Postby Guest » Tue Nov 09, 2010 7:47 pm

The E1 won go down unless L1 on the circuit goes down, which is independent of the network connectivity status to CUCM.

 

L2 on the circuit will go down when we lose connectivity to CUCM (assuming you don have the SRST fallback configuration call app alternate default configured).  A down L2 status should be enough of a status for the provider to hunt to another circuit, since that means there is no D-channel and no possible way to send a call to the router.

 

If you wanted to get fancy, you could use EEM to shut the controller down when L2 goes down, and run pings to CM until its back up, and unshut the controller.

Guest
 

Re:If the network connection to CUCM is down, if the E1 interface on MGCP...

Postby Guest » Tue Nov 09, 2010 8:36 pm

Hi Steven,

 

Thank you for your reply. The problem is that when the our MGCP router lost connection to CUCM, we ran "show ISDN status" and noticed that the layer 2 and layer3 on the circuit are still up.

 

Regards

Bob

Guest
 

Re:If the network connection to CUCM is down, if the E1 interface on MGCP...

Postby Guest » Tue Nov 09, 2010 9:07 pm

Hi

 

Do you have ccm-manager fallback-mgcp configured on this GW? That would switch the E1 over to terminate locally on the gateway for SRST purposes.

 

Aaron

 

Please rate helpful posts....

Guest
 

Re:If the network connection to CUCM is down, if the E1 interface on MGCP...

Postby Guest » Tue Nov 09, 2010 9:26 pm

If L2 is still up, then that means the PRI is switching over its D channel to terminate locally, like it does in SRST scenarios.

 

If you don want this:

 

application
global
  no service alternate default

no ccm fallback-mgcp

 

Keep in mind that if you disable this feature, this gateway will never function properly as an PSTN gateway for calls out this circuit when in SRST.  If this gateway isn an SRST router with call-manager-fallback configured, then you should have no worries.

Guest
 



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