Fax configuration on IP400 Phone (POTS/PSTN) Module 1

[ThePhatCoder]

Hi,

Our fax machines have an option to choose the line type.
There's PSTN, PBX and ISDN.

Which should I be using when the fax machine is connected to a PSTN module on a PBX connected via ISDN2e ?!

Since we moved premises and switched from ISDN30e to ISDN2e, we've been having problems sending/receiving faxes.
I read somewhere that changing the clock sync on the ISDN lines from Network to Fallback can help with fax problems. Anyone got any experience with this ?

Phatty.

 

[amriddle01]

you need it on PBX (or possibly ISDN all manufacturers are different), you have an analogue module not a PSTN module PSTN is the Public Swithched Telephone Network (BT), I have not seen any probs personally with ISDN2 and faxes, but if you have more than one ISDN 2 only one should be set to clock from network the others should be fallback.

ACS - IP Office Implement

"I'm just off to Hartlepool to buy some exploding trousers

 

[ThePhatCoder]

Hi.

Thanks for the info.
We've got 8 ISDN2e channels (four into a quad card in our IP406v1).
We've also got 7 SIP trunks coming into a Vega 500 through to the IP406 via a PRI card.

The VoIP channels are used for incoming calls, whereas the ISDN are prioritised for outgoing.

I'm wondering if the clock from the vega is being used, and if it's out of sync with the ISDN lines. I guess this could explain some of the line quality issues and fax problems we've been having.

I don't know much on the subject - can you recommend a good reference source so I can educate myself ? (the Avaya documentation doesn't go into any detail on the subject as far as I can tell)

I'll change the config tonight as per your recommendation and see what happens.

I'm rather surprised our telecomms provider didn't suggest we tried this, although I do sometimes get the impression they're better at selling than they are at installing/supporting...

_________________

Phatty.

 

[amriddle01]

If the IP Office has the SIP lines coming in through the PRI card that could well be throwing things off, it may be worth setting that to fallback to see if it helps, you can always chop and change settings until you find a config that works, but having 4 BRI lines and a PRI all set to clock will cause issues similiar to what you describe.

ACS - IP Office Implement

"I'm just off to Hartlepool to buy some exploding trousers

 

[amriddle01]

Sorry, just clicked what I suggested is slightly wrong, set One ISDN2 to be Network, One to fallback and the remaining two and the PRI to Unsuitable.

ACS - IP Office Implement

"I'm just off to Hartlepool to buy some exploding trousers

 

[amriddle01]

http://marketingtools.avaya.com/kno...ls/manuals/install/ip_office_installation.pdf

look at the "External Trunk Configuration" section under Clock quality.

ACS - IP Office Implement

"I'm just off to Hartlepool to buy some exploding trousers

 

[ThePhatCoder]

Again, thanks for the help.

As the PRI card is in slot B, it was being prioritised as the clock source. I made the changes and now (according to the monitor application), it's now using line 1 (which is BRI).

I'll run some more tests but initially faxes are coming in a lot better than before.

Once ISDN's sorted out, I'll check to see if T38 is being used between the VoIP gateways and enable logging of Jitter buffer problems.
I'll save that one for another thread :¬]



Phatty.