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Thursday, 18 August 2011

Enabling Cisco Call Manager (6.1) Music on Hold (MOH) Multistreaming

Enable Multicast :

global switch/router commands (VRF)

ip multicast-routing
ip pim send-rp-announce Loopback0 scope 10

ip pim send-rp-discovery scope 10

ip multicast-routing vrf

ip pim vrf INTERNAL send-rp-announce scope 100 -- Best practice is Loopback rather than interface

ip pim vrf send-rp-discovery scope 100

Add ip pim sparse-dense-mode to all Interfaces that need to participate in the multicast stream or pass traffic

Show commands :

sh ip mroute
sh ip mroute vrf INTERNAL

Output :
(*,, 01:35:57/stopped, RP, flags: SP
Incoming interface: , RPF nbr, RPF-MFD
Outgoing interface list: Null

Call Manager Config :

Enable Multicast on MOH Audio Source
Enable Multicast on MOH Server - default IP is
- enable increment port
Enable Multicast on Media Resource Group

NB//Enabling Multicast on the MRG requires endpoints to be reset to pick up the new settings, including gateways.

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