Vocie gateway D channel down by losing network connectivity to CCM?

Answered Question
May 7th, 2010

All,

Is there any possibility that losing network connectivity to call manager will bring down ISDN D channel on voice gateway or it is totally non related? I am running MGCP between voice gateway and CCM.

Thanks

I have this problem too.
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Correct Answer by William Bell about 6 years 7 months ago

Absolutely.  With MGCP, the ISDN Q.931 is backhauled to the CUCM.  This means that CUCM controls the D+B channels.  If CUCM is dropped (fault in host, network, etc.) then your Q.931 protocol exchange ceases and your D-channel (and B-channels) are dropped.

HTH.

Regards,

Bill

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Correct Answer
William Bell Fri, 05/07/2010 - 06:50

Absolutely.  With MGCP, the ISDN Q.931 is backhauled to the CUCM.  This means that CUCM controls the D+B channels.  If CUCM is dropped (fault in host, network, etc.) then your Q.931 protocol exchange ceases and your D-channel (and B-channels) are dropped.

HTH.

Regards,

Bill

Please remember to rate helpful posts.

David Hailey Fri, 05/07/2010 - 07:05

Most definitley. MGCP is backhauled to CUCM so connctivity issues

would result in losing the primary D Channel and the B channels. In

some instances a carrier flap may only show a D channel down but if

you know you lost connection then that would be the primary issue.

Sent from my iPhone

On May 7, 2010, at 9:43 AM, yuhuiyao

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