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Any idea why remote fax extension could be not working ?
Setup is the following: using Grandstream ATA adapter (HT70x or GXW40xx) or Cisco (Linksys) SPA (2102, 3102, 112, 122, etc.) fax is being registered as a fax extension and this is working normally, as expected. Provider is T.38 compatible, so faxes can be received also as e-mail. So far, so good - no issues. 3CX server is the latest V11SP4 running on MS Windows 2008R2 server.
Deciding to move the adapter and fax machine into another location the problems start. The main and remote locations are connected via high-speed internet (100 Mbps), ping is less than 3 ms, VLAN or VPN is set between locations or a GRE tunnel (same network segment), no difference. The adapter registers normally to 3CX server, starts to send or receive a fax message and communication dies during negotiation phase (fax error: No carrier). Two fax machines can communicate and exchange faxes without issues over the tunnel. The problem is with external parties. I tried to disable T.38, to check whether G.711 passthrough will be better, unfortunately, no result.
Fax machine in main location is fine, fax machine in remote location can send / receive faxes only to/from internal fax extensions.
Any ideas ? Is fax communication so sensitive to distance between 3CX server and ATA ?
Regards
Setup is the following: using Grandstream ATA adapter (HT70x or GXW40xx) or Cisco (Linksys) SPA (2102, 3102, 112, 122, etc.) fax is being registered as a fax extension and this is working normally, as expected. Provider is T.38 compatible, so faxes can be received also as e-mail. So far, so good - no issues. 3CX server is the latest V11SP4 running on MS Windows 2008R2 server.
Deciding to move the adapter and fax machine into another location the problems start. The main and remote locations are connected via high-speed internet (100 Mbps), ping is less than 3 ms, VLAN or VPN is set between locations or a GRE tunnel (same network segment), no difference. The adapter registers normally to 3CX server, starts to send or receive a fax message and communication dies during negotiation phase (fax error: No carrier). Two fax machines can communicate and exchange faxes without issues over the tunnel. The problem is with external parties. I tried to disable T.38, to check whether G.711 passthrough will be better, unfortunately, no result.
Fax machine in main location is fine, fax machine in remote location can send / receive faxes only to/from internal fax extensions.
Any ideas ? Is fax communication so sensitive to distance between 3CX server and ATA ?
Regards