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Choppy voice on calls to and from NetMeeting. RTP/RTCP port range may have overlap

Core Issue

Netmeeting uses the port range 49352-49408 for their RTP/RTCP flows. A lot of H.323 client vendors have done the same.

Resolution

Ensure that the port range for NetMeeting is included in the voice traffic class for Low Latency Queuing (LLQ). The normal port range configured for the voice traffic class is 16384-37276. For NetMeeting, extend this range to 49352-49408 as in access-group 102 in this configuration example. The signalling class needs to include H.323/H.225 signalling as in access-group 103 in this configuration example:

class-map match-all voice-traffic
  match access-group 102
class-map voice-signaling
  match access-group 103
!


!-- configuration omitted


access-list 102 permit udp any any range 49352 49408


!-- access-list 102 matches VoIP traffic based on the UDP port range
!-- Both odd and even ports are put into  the PQ.


!
access-list 103 permit tcp any eq 1720 any
access-list 103 permit tcp any any eq 1720

For more information about configuring LLQ, refer to VoIP over PPP Links with Quality of Service (LLQ / IP RTP Priority, LFI, cRTP).

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 06:10 PM
Updated by:
 
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