Grand stream fax issue

[Kkwok]

Hi I'm testing fax function on the allworx using Grandstream HT802 on Allworx 731 running version 9.0.6.2.
Got the fax adapter as generic sip device, it shows it is registered to the allworx box.

When i try to fax, i keep getting this message on the event log on 731,tSip: *** 200 OK timed out (no ACK) on 5102 (dialog 0x125b2744). Discarding call. Vendor and i been try messing with dial rule on grand stream box and no luck

Anyone can help on this mystery?

[wshrader]

Why use a "FAX adapter"? You could connect the FAX machine directly to one of the FXS ports. I assume that this "FAX adapter" is actually an ATA (analog telephony adaptor). Since you are registering this to the Allworx as a generic SIP device, you must be using a dialtone service on the Allworx. Is this SIP? PRI? Analog? Are you able to receive a FAX? To be more specific, does the FAX machine actually receive the call and attempt to answer it?

[Kkwok]

Because it for my remote branch. The 731 is at the head office. I have Grandstream ATA adapter setup a sip device.

[wshrader]

Because it for my remote branch. The 731 is at the head office. I have Grandstream ATA adapter setup a sip device.

That should have been noted originally. You did not answer my key question. Is the FAX machine at the remote site receiving incoming calls? There are various ways to determine this. Since this is a remote device, not on the same subnet as the Allworx server, I must revert to saying it is a network configuration problem. To prove this, take the Grandstream ATA and place it on the same network as the Allworx, configuring it, of course, appropriately. What happens then with both inbound and outbound FAX/call attempts?? You should thoroughly document the entire network between the Allworx and remote devices if you expect any help through a forum. Too much information is not possible.