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Sometimes get "One-Way-Audio"

We have 2 CCM 3.2(3)sr3 and Unity with centralized design. There is a branch building near our main building. We have 2 T1 and 10 MB wireless between two building.

Thats how we configure on those two routes:

interface FastEthernet3/0

bandwidth 10000

ip address 192.168.254.49 255.255.255.248

no ip redirects

service-policy output voice-priority

duplex half

!

interface Ethernet0/1

bandwidth 10000

ip address 192.168.254.50 255.255.255.248

no ip redirects

service-policy output voice-priority

no ip mroute-cache

half-duplex

As you can see, I apply LLQ on interface. Also, wireless is running on half-duplex.

Now, sometimes user complaint about one-way-audio. Is that because of half-duplex???

We use EIGRP for those 2 T1 and wireless routing, I apply LLQ on 2 T1(serial) and wireless(ethernet). I saw most of Voice and Data traffic use wireless. However, I saw there are a little "signaling" traffic on serial interface, but no voice traffic on that serial interface.

router#sh policy-map interface serial 3/1:0

Serial3/1:0

Service-policy output: voice-priority

Class-map: voice (match-all)

0 packets, 0 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp ef

Queueing

Output Queue: Conversation 265

Bandwidth 33 (%) Max Threshold 64 (packets)

(pkts matched/bytes matched) 0/0

(depth/total drops/no-buffer drops) 0/0/0

Class-map: signaling (match-all)

5848 packets, 303112 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp af31

Queueing

Output Queue: Conversation 266

Bandwidth 2 (%) Max Threshold 64 (packets)

(pkts matched/bytes matched) 9/472

(depth/total drops/no-buffer drops) 0/0/0

What I think of that, if user pick up handset, it will get dial tone(signaling) through serial interface (T1), and then voice traffice go to ethernet interface (wireless), will that cause one-way-audio???

I know my questions are confused and complicated.

Any suggestion and idea will be appreciated it.

Thanks in advance.

Ken

1 REPLY
New Member

Re: Sometimes get "One-Way-Audio"

Half duplex will cause quality problems, but should not cause the one way audio.

Is the config the same on the other end of the connection, I am assuming the config you provider was only on one side.

The behaviour you are talking about sounds like a asymmetric routing issue.

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