[Asterisk-Users] W&M Wink timings for Nortel

[Keith O'Brien]

        E&M is analogue, not digital...

 

Not true.   You can have E&M signaling on a T1 CAS interface.   Likewise T1
CAS interfaces can also be setup for FXS and FXO signaling.   This is just
how the robbed bits communicate.   With E&M wink before a remote switch
sends a call to a local switch it send a very 0/1 transition on the A bit.
When the local switch sees the wink it is supposed to respond with its own
"wink" back at the originating switch.  Then and only then is the call sent
over and DTMF is sent inband.  On T1s this wink parameter is tunable and you
should be able to set the wink pulse width and timing.   

 

I suspect that the Digium card either isn't answering the wink or is sending
it with the incorrect timing or pulse width.   The best way to troubleshoot
this is to place a T1 analyzer on the line such as Fireberd.   They can be
rented for a day from Electrorent.  

 

Also, you may want to see if you can setup the T1 span for immediate-start.
This would mitigate any wink problems.

 

For more info on how T1s work with voice see:

 

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a0080
0e2560.shtml

 

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