QoS: Remote Site IP phone connect to Main Site CCM

[chan-kuen.hui]

Dear All,

I will set up a new remote site office.

Remote office will connect to main office using T1 data line. IP phone at remote office will use main site office CCM. What kind of QoS is required for this connection? is CBWFQ ok? and how to define IP phone voice traffic (what protocol and Port # required)?

Thanks and Regards,

C.K.

[sdrennan]

There are lots of items you will have to configure which will take some time. Can I recommend you read the design docs. There is one for QOS which will cover most of this. Url is http://www.cisco.com/go/srnd

[rsamtani]

You need to configure LLQ on the T1 serial interface. Here is the configuration.

class-map match-all VoIP-Control

match access-group 101

class-map match-all VoIP-RTP

match access-group 100

!

!

policy-map VOIP

class VoIP-RTP

priority 768

class VoIP-Control

bandwidth 32

class class-default

fair-queue

!

interface Serial0/0:0.606 point-to-point

bandwidth 1544

ip address 10.30.151.2 255.255.255.0

frame-relay class IPTel

frame-relay interface-dlci 606

!

map-class frame-relay IPTel

frame-relay cir 1540000

frame-relay bc 15400

frame-relay be 0

frame-relay mincir 1540000

service-policy output VOIP

!

access-list 100 permit ip any any precedence critical

access-list 100 permit ip any any dscp ef

access-list 101 permit ip any any precedence flash

access-list 101 permit ip any any dscp af31

!

You don't need fragmentation, this is a T1 ckt.

Hope this works for you :)

[hendra.l]

If you want to be more specific than just the dscp value, try checking this page for the protocols / port used by CallManager 3.3:

http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_tech_note09186a00801a62b9.shtml

Those you want to prioritize is obviously the RTP (UDP 16384 - 32767) and the SCCP / Skinny (TCP 2000)

Good Luck,

Hendra Lesmana