Currently using a 28xx to mark the VoIP packets coming from an IP-PBX 3COM. I have seen the packets are market, however even though, I am reserving 67% of a 192 Kbps link, when two or more calls are placed the voice starts to degrade (until only one call is placed). I am thinking the issue could be related to a codec problem, the customer is telling me is using G729 but I think they are using G711. Is there a form to check this, in the 28xx router using a debug command. What other issues could be impacting the voice quality. I am attaching the configuration for the 28xx.
Re: VoIP degradation when two or more call are placed
at a first look I would recommend to place VoIP signaling traffic not under EF class but mark with CS3. Also use priority queueing and not WFQ for EF. Are you sure the UDP port range is set properly? Using NBAR should make sure to catch VoIP traffic even if other ports are used by the IP-PBX.
class-map match-all CS3
match access-group 102
class-map match-any PRUEBA
match precedence 5
match protocol rtp audio
class-map match-all voicep_BAN
match ip dscp ef
set ip dscp ef
set ip dscp cs3
priority percent 67
bandwidth percent 5
access-list 101 permit udp any any range 16384 32767
access-list 102 permit tcp any any eq 1720
access-list 102 permit udp any any eq 1720
access-list 102 permit tcp any any eq 1719
access-list 102 permit udp any any eq 1719
access-list 102 permit udp any any range 2048 3028
Can you execute a show service-policy interface Serial0/1/0.1? There should be no precedence 3 or 5 traffic in the default class.
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