11-16-2001 02:41 PM - edited 03-12-2019 01:24 PM
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.
11-17-2001 06:08 AM
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
11-19-2001 08:30 AM
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
11-18-2001 05:59 PM
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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