as5350 fax problem

[jeremy.chang]

I have a Cisco As5350 voice gateway with 4 E1 interface. It coneects to a remote AS5300 gateway by Internet . When the as5300 sends a fax to as 5350 ,it's ok ! But when as5350 sends one to as5300 , it will disconnects when they are handshaking .

The as5350 is configured as fax protocol t.38 & fax rate voice & fax-relay ecm disable.

What's the problem ?

[irisrios · Accepted solution]

The as5350 can work with T.38 only, hence you have to configure as5300 with T.38. And you also need to configure the incoming dial-peer on the as5300 as T.38

The additional configuartions on as5300 should be :

dial-peer voice 200 voip

incoming called-number .T

fax protocol t38 ls-redundancy 0 hs-redundancy 0

Also check if the codec and the clocking and compression techniques used are same, on both the ends.

[jeremy.chang]

Thank you for your reply .

I did configure as5300 with T.38 but did not confiure as5300 as t.38.

I will try it .

Thank you

[eyabane]

Jeremy,

did you try the configuration change, and did it fix the problem? I have seen an issue similare to this one, but didn't know how to resolve it.

Iris,

is this a known issue/difference between the 5300 and the 5350? i would like to know more about what specific command/feature causes the fax failure. any more elaboration you can add to your already-interesting comment would be really appreciated.

E.

[jeremy.chang]

Yes , I configured both the gateways as T.38 and it worked.