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Setting Router LLQ Priority for Picturetel H.323

NPT_2
Level 2
Level 2

I need to know what ports I need to assign to an llq QOS priority group on my 3640 routers for H.323 Video Conferencing with 2 Picturetel 970 Video Conferencing units for Voice and Video Priority, also what would you recomend for the amount of bandwidth allocated for voice and video on a point to point T1.

3 Replies 3

juan-santamaria
Level 1
Level 1

Hi , the TCP and UDP ports used by PT 900 Series

is the follow:

TCP traffic (port range: 1700 to 1750)

Call signalling for call establishment: 1720

UDP traffic

UDP audio traffics use port range 17000 to 17050

UDP video traffics use port range 17100 to 17150

Other UDP traffics, such as RAS, use port range: 1700 to 1750

IP Precedence TOS (type of service) byte usage:

UDP audio traffic use TOS byte of 0xA0 (IP Precedence 5)

UDP video traffic use TOS byte of 0 (IP Precedence 0)

I have a very similar equipment, but i don´t know much about llq apply to frame-relay. You can to help me, Because I need to configurate llq for Frame relay .Please

Thank you for your information. In response to your Frame Relay Question I am putting a sample config below. I am using this setup to prioritize voip over a frame relay link. You will have to adjust your port #'s in the access list for video and also will probably have to change the bandwidth settings and CIR settings for your particular frame CIR. I had the TAC help me with this configuration and as you can see it is a little more complex than on a Point to Point Link. Good Luck.

class-map match-all voiceframe

description voice traffic for Frame Relay

match access-group 105

class-map match-all dataframe

description data for frame relay

match access-group 106

!

!

policy-map llqframe

class voiceframe

priority 144

class dataframe

bandwidth 144

class class-default

fair-queue

interface Serial0

bandwidth 384

no ip address

encapsulation frame-relay

no fair-queue

frame-relay traffic-shaping

frame-relay lmi-type ansi

frame-relay ip rtp header-compression

!

interface Serial0.30 point-to-point

bandwidth 384

ip address xxx.xxx.xxx.xxx

frame-relay interface-dlci 30

class llqvoiceframe

map-class frame-relay llqvoiceframe

frame-relay cir 384000

frame-relay bc 3840

frame-relay be 0

frame-relay mincir 384000

no frame-relay adaptive-shaping

service-policy output llqframe

access-list 105 permit udp any any range 16384 32767

access-list 106 permit ip any any

sachon
Level 1
Level 1

Video conferencing systems use the rtp port range for media communications. This range is 1024 to 32757. Some VC systems allow you to configure a specific rtp port range for use. If so, you can narrow the port range necessary for your purposes. Remember that video calls actually use 2 rtp ports as voice and video are separate streams and both should be funnelled to the same LLQ.

As for b/w, a good formula to calculate necessary b/w - ISDN speed (e.g., 384k) + 10% IP overhead + 5% if encapuslating IP in frame relay or ATM or something.

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