RSVP-based Call Admission Control

The previous blogpost discussed about the bandwidth calculation for each of the CAC method:
http://pandaeatsbamboo.blogspot.com/2012/02/call-admission-control-bandwidth.html
In this blogpost we will go a bit more details on how to get it implemented.
RSVP bandwidth calculation is based on the worst case scenario.  For a G.729 call, it is 40Kbps and for G.711, it is 96Kbps.  However it will not based on worst case scenario for every call, it is only used for the first call.  Say for example if I want to implement RSVP-based CAC to 4 x G.729 call, it should be calculated as:
40Kbps + 24Kbps + 24Kbps + 24Kbps = 112Kbps
Okay, then the next step is the router configuration.

1. Create the MTP dspfarm profile with RSVP enabled

sccp local GigabitEthernet0/0

sccp ccm 192.168.20.20 identifier 1 version 7.0

sccp

!

sccp ccm group 1

associate ccm 1 priority 1

associate profile 2 register R1-MTP

!

dspfarm profile 2 mtp

codec pass-through

codec g729r8

rsvp

maximum sessions software 10

associate application SCCP

interface Serial0/1/0:0

no ip address

encapsulation frame-relay

fair-queue 64 256 47

frame-relay lmi-type ansi

ip rsvp bandwidth

!

interface Serial0/1/0:0.2 point-to-point

bandwidth 768

ip address 192.168.21.1 255.255.255.0

ip ospf mtu-ignore

snmp trap link-status

frame-relay interface-dlci 202

ip rsvp bandwidth 112

2. Create the MTP entry on UCM, add it to MRG and add the MRG to MRGL.  Assign the MRGL to the device pool / phone.

3. Create Locations, mark the two locations relation as RSVP "Mandatory".

4. Make calls from between the 2 sites, do a "show ip rsvp reservation"

R1#sh ip rsvp reservation

To            From          Pro DPort Sport Next Hop      I/F      Fi Serv BPS

192.168.22.254 192.168.24.254 UDP 18176 16670 none          none     FF LOAD 24K

192.168.24.254 192.168.22.254 UDP 16670 18176 192.168.21.2  Se0/1/0: FF LOAD 24K

Since the ip rsvp bandwidth is 112Kbps, you are allowed to make up to 4 G.729 calls and when you try to make the 5th call, you will see the message "Not Enough Bandwidth" on the phone.