[cisco-voip] Interwork External Multicast MOH source to Unicast MOH (CSCuu65414)

[Mark Holloway]

As mentioned in Bug Search, CUCM 10.0 and newer did not allow an external USB audio interface to be used where a fixed audio source could be played as Unicast, therefore requiring CUBE to do multicast/unicast conversion for PSTN SIP Trunk calls. I noticed the update to this bug on February 20th says Status: Fixed. If I’m reading this correctly, CUCM may be configured to listen to a multicast stream on the network and will do the conversion on the server to Unicast when calls are placed on hold. 







Symptom:
Customers that have been using CUCM releases prior to CUCM 10.0 on MCS (hardware) servers had the capability of using a USB MOH sound device to connect an external audio source such as CD, Radio, Jukebox, etc. for use as a CUCM Music-on-Hold audio source. This enabled playing custom or live music on hold for callers capable of multicast stream reception and/or for callers requiring a unicast stream (such as mobile callers).

Conditions:
Starting with CUCM 10.0, the MCS (hardware) servers are no longer supported. Only VM installation is supported. This also means that the USB MOH sound device are also no longer supported for an external Music-on-Hold audio source. To overcome this limitation, you can configure Cisco Unified Survivable Remote Site Telephony (SRST) router as an audio source. This router provides multicast MOH audio for devices that are capable of multicast reception. In this approach, devices act as if Cisco Unified Communications Manager is sending the multicast MOH audio. However, in this approach too, devices that are capable of only the unicast reception cannot hear the MOH audio that an external MOH source (for example, Cisco Unified SRST router) sends. Devices that are capable of only unicast reception can be public switched telephone network (PSTN) phones, destination to session border controllers (SBC), and Session Initiation Protocol (SIP) trunks.

Workaround:
None

Further Problem Description:
This feature develops capability to configure one or more external Multicast Source(s) on CUCM Audio Source configurations. CUCM MOH will support receiving one or more multicast RTP Music stream from an external multicast source and unicast/multicast it to held callers. This allows replacing one or more of the MOH wav file audio sources with external multicast stream(s).
Depending on what hardware / software is used to provide the external multicast stream(s), the originating source could be from a wav file, CD player, radio, or other audio device. As an example the Cisco SRST GW/Router can use an E&M port to connect a CD player as a source.
MOH Audio Source Configuration page on CUCM admin is enhanced to configure following fields :
i)Rebroadcast External Multicast Source
ii)Source IPv4 Multicast Address
iii)Source Port Number

This feature has no impact on existing functionality of playing multicast MOH audio using external
audio source for the devices that are capable of multicast reception.
For unicast media connection, Cisco Unified Communications Manager MOH Server plays initial
announcement and periodic announcement even if you configure the MOH audio source with external
multicast source.

Codec Specific Inbound Stream using External Multicast Source :
Configure an external multicast audio source, such as Cisco Unified SRST router, to MOH server for streaming the required audio feed.
i)Cisco Unified Communications Manager listens to multicast G.711 mu-law stream on external multicast
IP address and port that you configured on the MOH Audio Source configuration window. An MOH
server can transcode between the G.711 mu-law or a-law or L16 256K wideband MOH codecs. The
external multicast RTP stream uses G.711 mu-law codec for MOH as a source for G.711 mu-law or
a-law or L16 256K wideband MOH codecs. For G.711 a-law and wideband calls, Cisco Unified
Communications Manager MOH server transcodes the inbound G.711 mu-law stream to outbound G.711
a-law or wideband stream before sending it to the device.
ii)Cisco Unified Communications Manager listens to multicast G.729 stream on external multicast IP and
port value added with four that is configured on the MOH audio source configuration window. For
example, if you configure an MOH audio Source with 239.1.1.1:16384, Cisco Unified Communications
Manager listens to G.711 mu-law stream on 239.1.1.1:16384 and G.729 stream on 239.1.1.1:16388 (port
value added with four). An MOH server cannot transcode for G.729 codecs. Callers who are using MOH
G.729 codec require an external multicast RTP stream using G.729 or G.729a codec.

Customer Visible

Add Notification

Save Bug

Open Support Case
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20160226/16b50dc1/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PastedGraphic-1.png
Type: image/png
Size: 170606 bytes
Desc: not available
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20160226/16b50dc1/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Add_notification_1335_16.png
Type: image/png
Size: 1592 bytes
Desc: not available
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20160226/16b50dc1/attachment-0001.png>