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VoIP across Frame Relay?

markw
Level 1
Level 1

Hello, I'm trying to get my head around putting in VoIP across a Frame Relay link. and im new to putting in QoS across frame.

We have the main office with call manager and a satellite office with 25 phones.

the link has a 2meg port speed with a 1meg CIR.

Can some one have a look at my config and let me know if i have done it right

thanks in advance

(I've only included the relevant parts of the config)

!

class-map match-all VoIP-Sig

match ip dscp af31

match ip precedence 3

match access-group name ACL-VoIP-Sig

class-map match-all VoIP-RTP

match ip dscp ef

match ip precedence 5

match access-group name ACL-VoIP-RTP

!

policy-map VOICE-POLICY

class VoIP-RTP

priority 480

class VoIP-Sig

bandwidth 16

class class-default

fair-queue

!

!

interface Serial0/0

no ip address

service-policy output VOICE-POLICY

encapsulation frame-relay

no ip route-cache

no ip mroute-cache

frame-relay lmi-type ansi

!

interface Serial0/0.16 point-to-point

ip address 10.10.10.18 255.255.255.252

no ip route-cache

no ip mroute-cache

no cdp enable

frame-relay interface-dlci 16 IETF

!

!

map-class frame-relay VOIPovFR

frame-relay cir 1024000

frame-relay bc 10240

frame-relay mincir 1024000

service-policy output VOICE-POLICY

frame-relay fragment 320

!

ip access-list extended ACL-VoIP-RTP

permit udp any any range 16384 32768

ip access-list extended ACL-VoIP-Sig

permit tcp any eq 1720 any

permit tcp any any eq 1720

permit tcp any any eq 2000

permit tcp any eq 2000 any

!

1 Reply 1

j-macdonald
Level 1
Level 1

Are you running 12.2(15)T or higher IOS code? If so, the "auto qos voip" command makes life a lot easier. If you don't know a lot or aren't sure too sure about QoS configuration, it saves a lot of grief and misconfiguration. However, if you want to fine tune or go it the manual way, I do see something. Your frame relay fragment command is way to low. To calculate frame fragement you divide your CIR (1024) by 64 and multiply by 80. So in this case 16 X 80 = 1280. Frame-relay fragment should be 1280.

Hope that helps,

Best regards

John