I visited a UK based taxi cab company today where I found a 7+ year old setup comprising fibre lines connecting to a BT ASDH NTE 4U / 7A router with a CAT5 cable connecting from the router to a Norstar Meridian phone system.
I have never come across this setup before and am not familiar with SDH technology. The company thinks they have 15 phone lines. I could not clarify this.
Assuming that the ASDH router presents the phone lines to the Norstar switch as E1 / T1, I went about configuring a Digium TE220 as follows;
channel => 1-15
I am using the latest versions of Asterisk;
DAHDI Linux 22.214.171.124
DAHDI Tools 2.2.0
When I connected the card to the ASDH router, both ends appeared to sync (i.e. the lights at each end went green) but the DAHDI channels stayed in RED ALARM and incoming calls could not be received (usual dead tone). There was no information in the Asterisk log at all. At this point, I didn’t want to test/debug this any further without knowing what I was dealing with. I have tried researching the configuration but without any success.
I am therefore posting in the hope that someone will be familiar with this type of equipment or will be able to clarify that the ASDH router is indeed presenting E1 / T1 to the switch and if so, advise on what settings I need to configure Asterisk / Dahdi with to get this working?