My customer is looking at an Adtran Atlas 550 to support a fax server application that I'm hoping can be done with a 2800 series router. I've tried several approaches, but cannot seem to get it to work.
1) Call from a remote Fax machine come into a CAS T1 connected to a VWIC on a 2800 router. There are 4 DNIS numbers supported on the CAS T1.
2) The call needs to be forwarded to a FAX server that connects as an analog station. There is a FXS/DID card also in the same 2800.
3) The fax server needs to answer the call and wink back to the telco to send DNIS.
4) The telco forwards DNIS to the router which will send it to the fax server which uses it to route the fax.
From the Adtran web site, this is a Q&A about this feature:
Q: How can I use the DNIS delay option of the TSU voice FXS cards to signal an off-hook condition back to the telco after a simulated delay needed to allow my called device time to answer? For example, my called device will be a Fax Server.
A: The TSU's network port is connect to the telco's T1 line. The FXS card uses its analog 2-wire ports to connect to (in this example) the fax server. When a call comes in from telco, the FXS card then sends ring voltage to the fax server. The fax server responds by answering the call. The FXS card winks back to telco that the server is ready for DNIS. At
the same time the FXS card winks, it starts counting down the time configured under the DNIS delay option. The fax server receives the DNIS tones and uses them to route the call to the appropriate fax machine. This procedure takes a few seconds to route and for the fax machine to answer. When the DNIS delay time has expired, the FXS card sends an off hook condition to the telco to finish connecting the call.
Issue: I want to avoid buying a Adtran 550 and would prefer to use one of my 300 2821 routers. Can this be accomplished?
FAX machine--pots---telco---CAS T1---2800--FXS--fax server.
The issue appears to be my traditional approach to this where the router receives DNIS and makes routing decisions - either local POTS or VoIP peers. The probem with this approach is that DNIS has already been collected by the router. Here is the T1 controller configuration and other info snip'd from the current configuration:
controller T1 0/2/0
cablelength long 0db
ds0-group 0 timeslots 1 type e&m-wink-start dtmf dnis
dial-peer voice 2530043 pots
incoming called-number 0043
dial-peer voice 92530043 pots
I also tried the connect statement which essentially cross-connects the T1 to the pots line and made the FXS/DID port DID...like this:
signal did delay-dial
connect fax-connect voice-port 0/1/0 t1 0/2/0:0
With this I get a busy signal whose cadence corresponds directly with the attached analog station ringing.