Appendix B: Integrating Cisco Unified Communications Manager and Cisco Unified SRST to Use Cisco Unified SRST
How to Use Cisco Unified SRST Gateways as a Multicast MOH Resource
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Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
Use this procedure to enable multicast and configure port numbers and IP addresses.
Step 1
Enable multicast MOH for Cisco Unified CM.
a.
Choose
Service
>
Media
Resource
>
Music On Hold Server
.
b.
The MOH Server Configuration window appears.
c.
Call up an existing MOH server by clicking
Find
and double-clicking the required MOH server.
d.
Whether you are updating an existing MOH server or creating a new one, click
Enable Multicast
Audio Sources on this MOH Server
.
Step 2
Set the base IP address and port number.
In the MOH Server Configuration window, enter an IP address in the Base Multicast IP Address field
and enter a port number in the Base Multicast Port Number field. Ensure that the IP address and port
number use the required audio source and codec. See
Table 2
.
Step 3
Select whether Cisco Unified CM increments port numbers or IP addresses.
In the MOH Server Configuration window, in the Increment Multicast on field, choose
Port Number
if
you want port numbers to be incremented and the IP address to remain unchanged. Choose
IP Address
if you want IP addresses to be incremented and the port number to remain unchanged.
•
If all of your branches run Cisco Unified SRST and thus use G.711 for MOH, use either setting
because incrementation does not take place and a selection does not matter.
•
If your system configuration includes routers that do not run Cisco Unified SRST and use a different
codec, select an incrementation method.
Note
If your branches include routers that do not run Cisco Unified SRST and do use G.711, configure
separate audio sources: one for the routers that run Cisco Unified SRST and one for the routers
that do not.
Step 4
Enter a maximum number of hops.
In the MOH Server Configuration window, next to the Audio Source Name field, enter 1 in the Max Hops
field if all of your branches run Cisco Unified SRST. If your system configuration includes routers that
do not run Cisco Unified SRST, enter 16 in the Max Hops field.
Step 5
Use Cisco IOS commands to stop Cisco Unified CM signals from crossing the WAN and reaching
Cisco Unified SRST gateways.
If all of your branches run Cisco Unified SRST, skip this step. If your system configuration includes
routers that do not run Cisco Unified SRST and use a different codec, enter the following Cisco IOS
commands starting from global configuration mode on the central site router:
a.
interface
{
serial
|
fastethernet
}
slot
/
port
Enters interface configuration mode, where
slot
is the slot number and
port
is the port number.
b.
ip multicast boundary
access-list-number
Configures an administratively scoped boundary, where
access-list-number
is a number from 1 to 99
that identifies an access list that controls the range of group addresses affected by the boundary.
c.
exit
Exits interface configuration mode.
