If an inwards voice call through a Foreign Exchange Office (FXO) port is hairpinnined back out another FXO port on one of these voice cards (new generation NM-HD-2V, NM-HD-2VE, NM-HD-HDV2 voice modules), the Supervisory Disconnect Tone feature does not work correctly. This may be due to an IP phone being call forwarded to an external number or a direct transfer from an IP phone to external number.
If a call comes through the voice port and is directed to a Voice over IP (VoIP) device (IP phone, voice mail, etc.), the disconnect tone feature functions correctly.
The new generation voice cards have a Time-Division Multiplexing (TDM)-based architecture. The Digital Signal Processors (DSPs) are dropped out of call paths if the call is hairpinned between two ports on the same network module, since technically they are no longer required. Therefore, the Pulse Code Modulation (PCM) audio stream from one port is connected directly to the other port.
As a result, the Supervisory Disconnect Tone feature is not active, since there is no DSP monitoring the audio streams for the configured disconnect tones.
To resolve the issue, add this configuration:
This command changes the default behaviour of the voice card and keeps the DSP across the audio stream for the duration of the call, even if the call is later connected directly to another voice port on the same network module. Therefore, the Supervisory Disconnect Tone feature is active as expected.
In order to speed up the disconnection if the Supervisory Disconnect Tone feature is used, issue these commands to the voice port configuration:
timeouts call-disconnect 5timeouts wait-release 5
These settings shorten the time the router waits before it determines that the call needs to be dropped due to disconnect tones played by the network. The normal Cisco IOS defaults are 30 and 60 seconds respectively, so these reduce the drop time to 5 seconds:
For further information on Supervisory Disconnect Tone problems, refer to these documents:
Hi All, We are on CUCM 12.5 and CCX 12.5, from time too time we get the swap disk partition going over 90% and gets stuck there.Currently we resolve the issue by rebooting the affected server.I have been reading up since the customer started asking q...
Hello cisco community, in the book CLCOR 350-801 I read the following statement on pages 202 and 203: The phone will then use these VLANs (data and voice switchport configurations) to tag all communication originating from the phone with the voi...
CME 12.0 - 9971 registered phone, phone A (sip9971) calls phone B (sip7975)Phone B (sip7975) has a conf softkey and can initiate a adhoc conference with phone C (sip 9971) all is well. If you try to replicate this the other way around there is no con...
Hi I'm looking for IOS Voice image for 2821 router in version 15.XAs this one: c2800nm-ipvoicek9-mz.151-4.M12a.bin [for 2821]I have it in version 12 but it has a limitation in translation rules. As this router is now EOS, there is no download availab...
Hello all, I nedd your help please ! I have a cucm 12.5 integrated with VG-323 with protocol SCCP. all work fine , but i can't see the name of caller when i have a incoming call on analog phone. Could you help me please ? Best regardsA...