AS5400 crosstalk

Daniele Giordano · ‎03-22-2013

I've found this note about the issue in title:

Symptoms: Crosstalk being heard intermittently on inbound calls.

Conditions: Inbound calls from PSTN to Ingress gateway hearing crosstalk on Rout call leg (DSP to PSTN) on AS5400XM.

Workaround: The following command in IOS can mitigate this for SIP:

voice service voip sip source filter

This eliminates the risk for crosstalk since the gateway blocks all rogue audio out to the PSTN with this command.

The above command only works for SIP, so H323, MGCP, and SCCP are still affected.

The following enhancement requests have been filed:

CSCtq47019 - support on H.323, SCCP, and MGCP. This will allow the command to be used in all VoIP environments.

CSCtq47431 - To get this feature added to IP phones.

Do you know if Cisco has already prepared a workaround for MGCP scenario?

Regards.

Daniele Giordano · ‎04-07-2013

The bug CSCtk34885 (about crosstalk problem in SIP scenario) had the high severity level 2 and was fixed.

Cisco AS5400 is widely used with Cisco PGW 2200 Softswitch.

The gateway is controlled via MGCP.

So I don't understand why the crosstalk issue in the MGCP scenario is not yet solved.

Can anyone help me?

Regards.