Linksys PAP2T fax support?

[Mitelpassion]

has anyone used the linksys pap2t for faxing? it works fine with analog phones but am having difficulty using this with faxing?

if so is there anything glaringly obvious that needs to be configured other than the 20ms codec?

thanks in advance

 

[IrwinMFletcher]

What part of the fax fails? Does it ever start sending or does it fail in the call setup?

From the details of if (a la Google), it looks like it doesn't support T.38, so it's straight 'voice' which in general doesn't go well over IP.

Can you give a bit more of your setup information? Who calls who over what link etc.

 

[slapin]

It is passthrough faxing. So if it is a private IP network, make sure you setup proper DSCP for priority queuing. If it is a public Internet connection it may not work properly.

I have good experience with Grandstream HT-502 in T.38 mode

 

[Mitelpassion]

No T38.
Straight voice faxing.
These extensions are used for faxing both in and outbound. Inbound appears to be working ok and if you connect an analogue phone it appears just fine both ways (I'm aware that analogue phone is not faxing

It doesn't even start.
If I can get this to work every now and again it would be better than never at all. I'm very aware of fax over IP (not T.38) being dodgy at the best of times ....
linksys set up as SIP extension not trunk.
system 3300 MXe 9.0 UR 1

thanks,

 

[IrwinMFletcher]

It may be the type of fax machine that you are using, do you have access to other types? Or try calling to a different fax machine. One of the big differences is that some machine don't send the CNG tone, some do, this can have a big effect on the behaviour of both IP devices and TDM network devices.

If they work on the inbound direction all the time, then it's not a network problem (jitter, packet loss, etc).

Or another thing, make the linksys G711. If the 3300 detects that it's a fax call it will try to renegotiate to G711, which the linksys may not handle well.