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Connection trunk quality problem between 3640 and 3660

I have a connection trunk quality problem between a 3640 and 3662 (or 3745) routers. After setting up the connection trunk, I tested the quality by sending a 1KHz tone (using an analog tester). Here is the result: -

Transmit........Receive.........Result

---------------------------------------

3640(NM-2V).....3662(NM-2V).....Tone receive good

3640(NM-2V).....3745(NM-HD-2V)..Tone receive good

3662(NM-2V).....3640(NM-2V).....Tone receive with noise

3745(NM-HD-2V)..3640(NM-2V).....Tone receive with noise

This problem doesn't happens if the connection trunk is between a 3662 and 3745 routers as the result below indicates.

Transmit........Receive.........Result

--------------------------------------

3662(NM-2V).....3745(NM-HD-2V)..Tone receive good

3662(NM-2V).....3745(NM-2V).....Tone receive good

3745(NM-HD-2V)..3662(NM-2V).....Tone receive good

3745(NM-2V).....3662(NM-2V).....Tone receive good

Can someone tell me how can I solve this problem?

Here's what I have configured inside the routers: -

On the 3640 (with NM-2V and VIC-2E/M) -

-------------------------------------

!

interface Ethernet0/0

ip address 10.81.1.2 255.255.0.0

full-duplex

!

..

..

voice-port 1/0/0

echo-cancel coverage 32

no comfort-noise

timeouts wait-release 3

connection trunk 9001

operation 4-wire

type 2

signal immediate

!

..

..

dial-peer voice 9000 voip

destination-pattern 900.

session target ipv4:10.81.1.1

dtmf-relay h245-alphanumeric

codec g726r24

ip precedence 5

!

dial-peer voice 8001 pots

destination-pattern 8001

port 1/0/0

!

On the 3660 (with NM-2V and VIC-2E/M)

-------------------------------------

!

interface Ethernet6/1

ip address 10.81.1.1 255.255.0.0

full-duplex

!

..

..

voice-port 5/0/0

operation 4-wire

type 5

signal immediate

input gain 2

echo-cancel coverage 32

echo-cancel suppressor 9

timeouts call-disconnect 3

timeouts wait-release 3

connection trunk 8001

!

dial-peer voice 9001 pots

destination-pattern 9001

port 5/0/0

!

dial-peer voice 8000 voip

destination-pattern 800.

session target ipv4:10.81.1.2

dtmf-relay h245-alphanumeric

codec g726r24

ip qos dscp cs5 media

no vad

!

Thanks very much.

3 REPLIES
Hall of Fame Super Gold

Re: Connection trunk quality problem between 3640 and 3660

Does it happens with any codec, or g726 only? Which exact IOS are you using on the 3640 ?

New Member

Re: Connection trunk quality problem between 3640 and 3660

It seems ok with codec g711ulaw. The analog tester tone is received without noise.

But I prefer to use g726r24 since the bandwidth utilization is much lower than the g711ulaw.

I'm running using c3640-is-mz.122-10d.bin on the 3640.

Hall of Fame Super Gold

Re: Connection trunk quality problem between 3640 and 3660

Upgrade 3640 to latest maintenance of 12.2 and try again. You can try g729 that is the best compromise and more tested codec.

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