Multicast Music-on-Hold and IP/TV Configurations
Changing the Default CODEC
From the Call Manager Admin main page, select Service >System Parameters >Cisco IP Voice Media Streaming App>DefaultMOHCodec.
Step 2 Step 3
Change the defaults as desired, Click on Update to save the changes.
To change the default CODEC used for streaming MoH, do the following:
Verifying the Configuration
After placing a call on hold that has been configured with a multicast-enabled audio source, run the show ip mroute active command to see the Multicast MoH stream at the branch office. For example:
show ip mroute active
Active IP Multicast Sources - sending
>= 4 kbps
Group: 188.8.131.52, (?) Source: 10.5.10.20 (CM-MoH)
Multicast MoH - G.729 address
Rate: 50 pps/24 kbps(1sec), 23 kbps(last 53 secs), 22 kbps(life avg)
QoS for Music-on-Hold
Although this document does not go into detail on the QoS features and configurations for IP Telephony and Music-on-Hold, there is one recommendation for MoH that should be mentioned here:
Over provision the Low-Latency Queue (LLQ) by one or two streams to account for the additional traffic brought on by MoH.
Multicast MoH is classified as RTP bearer traffic (DSCP=EF). MoH streams will inherently take advantage of QoS deployed on the network for IP Telephony.
For information about configuring QoS for IP Telephony, see the Cisco AVVID Network Infrastructure Enterprise Quality of Service Design guide.
The Cisco IP/TV solution is used to serve media streams for live broadcast, stored broadcast, and on-demand content. The server used in this design is streaming out to multicast groups using pre-recorded files. IP/TV servers provide streaming of Video, Audio, and Slidecast (presentations) media.
The following are guidelines for implementing IP/TV with IP multicast: Use multicast addresses found in the administratively scoped address range. Associate multicast group ranges for each type of stream.
Cisco AVVID Network Infrastructure IP Multicast Design