Continuity Check Failed with MGX_8850 VISM(AAL2 Trunking Mode)

[hectorp]

Hi,

We are trying to connect two voice switches using two MGX_8850 for voice compression with VISM AAL2 Trunking Mode.

The traditional connection between switches uses a 900Hz tone called Continuity Check to test the quality of the DS0, if this tone is not correct the switch blocks the DS0.

When we tried to use the VISM to compress the voice traffic the continuity check failed, It seems that there is something in the configuration of the VISM that is not allowing the Tone to pass (Distortion).

I've tried with multiple codecs and profiles and it's not working.

[ciscomoderator]

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (http://www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at http://www.cisco.com/tac/caseopen

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.