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R4

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Posts: 199
Reply with quote  #1 

Just a heads up guys, I have a customer who has been complaining of fax failures since they went over to Business SIP. The fax service is delivered over a separate ATA but the customer was getting constant fax failures.

It turns out that the customer who is a medical practice, faxes mainly to a medical imaging company who uses a Vocus fax stream type service and due to a handshaking issue with that service which only applies to faxes from a SIP service, it switches to a wrong mode and the fax fails. I am not 100% sure of the technicalities but Telstra is liasing with Vocus to resolve the issue. So if you have customers complaining of faxes failing, this could be the issue!

R4

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Posts: 199
Reply with quote  #2 
Ok so I have gleaned some more info here. apparently it is something to do with the initial handshaking where the fax tries to negotiate speed, I believe the thing is it tries to negotiate as super group3 but becausee the sending party is on voip, it can't communicate at the speeds for that and needs to train down. However the receiving end doesn't try to train down and so the session fails! Telstra is apparently reaching out to Vocus to try to resolve the issue!
R4

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Posts: 199
Reply with quote  #3 
Ok so the latest issue is that Telstra in their infinite wisdom have decided not to support 9 digits on business sip. So far this has caused issues on Alcatel and Panasonic systems.
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