I have an Asterisk server connected to a Nortel Pbx via an E1.  Everything works fine, I get calls in and out with callerid. The problem that has been reported to me is the following scenario:

A call comes in from the PSTN and is answered by Asterisk. The person dials the operator (1000) which is on the Nortel side so connection is made through the E1. The operator answers  and then transfers the call back to a SIP extension on the Asterisk (1303). The result is no audio and a dropped call.

My main theory at the moment is that when the receptionist hangs up after the transfer the E1 drops on the Nortel side. Anyone here with  this type of integration seen this problem?

Hi,

Does anybody knows about the PSTN frequency parameter with on/off hook
times for the city Nicaragua. This is part of USA below to Mexico.

Regards.

I have two lines, fax & voice.
I usually call out on fax line (to have voice line available)

I need to set the dial line based on dial-status. When I try to call out on fax line and it is receiving a fax will I get a BUSY or CONGESTION signal?

What is the difference in dial plan condition: “goto” and “gotoif”

exten => 1,1,Dial(SIP/7780${EXTEN}@pstn-9998,60,tr)
exten => 1,2,Goto(1-${DIALSTATUS},1)
exten => 1-BUSY,1,Dial(SIP/9780${EXTEN}@pstn-4444,60,tr)
exten => 1-CONGESTION,1,Dial(SIP/9780${EXTEN}@pstn-4444,60,tr)

vs.

exten => 1,1,Dial(SIP/7780${EXTEN}@pstn-9998,60,tr)
exten => 1,n,GotoIf($["${DIALSTATUS}"="BUSY"]?line2)
exten => 1,n,GotoIf($["${DIALSTATUS}"="CONGESTION"]?line2)
exten => 1-n(line2),1,Dial(SIP/9780${EXTEN}@pstn-4444,60,tr)

I’m setting up res_fax to use with an iax provider. I’m calling over
PSTN to the provider. When I stand at our fax machine (Brother), I can
see the call come in, and it appears to set up correctly. What is odd,
however, is that asterisk drops off while the fax machine is still
sending. I’ve lowered the baud rate to 9600, it’s a single page fax.
After less than 10 seconds asterisk stops receiving the fax, but the
machine continues sending for another 20 seconds or so.

ReceiveFAX(“IAX2/FaxIAX-4579″,
“/var/spool/asterisk/fax/20120317_1820.tif,df”) in new stack

Hi all,

I’ve tried to explicitly set my two PSTN trunks/FXO lines to alaw with:

alaw = 1-2

in /etc/dahdi/system.conf. However, when I do this, all I get is loud
intense noise on the line and nothing else – can’t dial, can’t make
calls, can’t receive calls. If I omit it altogether, everything works fine.

As I’m in the UK – I thought Europe uses alaw on phone lines – how come
Asterisk seems to be using only ulaw – and alaw won’t even work? Config
examples on the Internet seem to suggest that it should work.

Thanks for any help,

Sebastian