12-02-2003 06:38 AM - edited 03-02-2019 12:05 PM
we are using cisco ATA 186 to make international call via IP i.e VOIP. We have a cisco 1600.
We have 256kpbs of bandwidth, same is used by quite a few users for other purpose like surfing etc...
When we make calls using this ata the call lag (latency) is very high some time it very bad we just can hear the other person.
I tried Priortiy Queuing and then i m using now Custom Queuing without much of change.
Can any help me in queuing or traffic shaping or any thing that can help me to improve with the latency. I dont mind if the other user get less bandwidth during the call period.
here is my config, the ip given to my ata 186 is denoted by C.C.C.226
Regds
RamP
!
ip subnet-zero
ip name-server A.A.A.A
isdn switch-type basic-ni
!
!
!
interface Ethernet0
ip address B.B.B.1 255.255.255.0 secondary
ip address c.c.c.225 255.255.255.224
no ip directed-broadcast
ip nat inside
!
interface Serial0
backup delay 30 60
backup interface BRI0
ip address D.D.D.D 255.255.255.252
no ip directed-broadcast
ip nat outside
custom-queue-list 1
!
interface BRI0
ip address negotiated
no ip directed-broadcast
ip nat outside
encapsulation ppp
dialer idle-timeout 300
dialer string 28529200
dialer hold-queue 10
dialer-group 1
isdn switch-type basic-net3
ppp authentication pap callin
ppp pap sent-username URURE@KSKSKS.COM password 7 141E1C0D05172E25757A075
!
ip nat inside source route-map rtm-nat-bri0 interface BRI0 overload
ip nat inside source route-map rtm-nat-ser0 interface Serial0 overload
ip nat inside source static C.C.C.226 D.D.D.D
ip nat inside source static F.F.F.3 C.C.C.227
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0
ip route 0.0.0.0 0.0.0.0 BRI0 100
ip route F.F.F.0 255.255.255.0 B.B.B.5
!
access-list 101 permit ip any any
access-list 101 deny icmp any any
access-list 102 permit tcp host C.C.C.226 any eq 16834
access-list 102 permit tcp host C.C.C.226 any eq 16835
queue-list 1 protocol ip 1 list 102
queue-list 1 default 2
queue-list 1 queue 1 byte-count 20480
queue-list 1 queue 2 byte-count 1
dialer-list 1 protocol ip list 101
route-map rtm-nat-ser0 permit 10
match interface Serial0
!
route-map rtm-nat-bri0 permit 10
match interface BRI0
!
!
12-02-2003 06:52 AM
I would suggest
1.To use Low latency queing if your router IOS supports. Pls refer to
http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080103eae.shtml
http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080160fc1.shtml
2.To enable QOS features on in the ATA itself.
12-02-2003 09:12 PM
I think the deafult codec for ATA is G711, if it is so try to make it G729 (You can have only one FXS port operating with this codec in ATA, this is product limitation). G729 minimizes the bandwidth needed.
Second, as said in the previuos posting use LLQ for voice or IP RTP Priority for simplicity. I recommand IP RTP priority here as you dont want to give any preferential treatment to other data traffic. If you face any difficulty during call setup give preferred treatment to VOIP signalling traffic with CBWFQ (in most of the cases it is not needed).
Since you are using NAT here, I assume you are connecting to local ISP. What ever I said above makes sense only if you have an SLA with your ISP for min end-to-end delay.
-Subba
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