POTS hangup problem [Resolved]


#1

I usually test the POTS connectivity of my SOHO system by placing calls from my cell phone. This is the US, my POTS Telco is Verizon. All is well for the most part, except: When I hang up at the end of Asterisk, I hear some sort of sound on the cell phone which might be a “hang-up” signal from Asterisk/Zaptel, but the call does not end on the cell phone. Obviously I am trying to tune this problem out of my system. Configuration: Kernel 2.4, Asterisk 1.2.4, zaptel-1.0.10, one X100P clone.
Here’s the log from /var/log/asterisk/messages.

Mar 12 22:18:47 VERBOSE[1407] logger.c: – SIP/JP-O-368f is ringing
Mar 12 22:18:54 VERBOSE[1407] logger.c: – SIP/JP-O-368f answered Zap/1-1
Mar 12 22:19:22 VERBOSE[1407] logger.c: == Spawn extension (macro-stdexten, s, 1) exited non-zero on ‘Zap/1-1’ in macro 'stdexten’
Mar 12 22:19:22 VERBOSE[1407] logger.c: == Spawn extension (incoming, s, 3) exited non-zero on 'Zap/1-1’
Mar 12 22:19:22 VERBOSE[1407] logger.c: – Hungup ‘Zap/1-1’

I am under the impression that zaptel is trying to send some form of hangup signal through to Verizon, but for some reason that does not propagate to my cell phone as such. I’m not going to change Verizon (;->), so I am left with trying to tune the system. I had this problem with other configurations on my machine as well: Asterisk 1.0.9/Zaptel 1.0.9, Asterisk 1.2.4/Zaptel 1.2.3.

I experimented by raising txgain from 0db to 3db. No difference with respect to the problem so I went back to 0. Question: I have no idea what else to try, anybody know a few touchpoints to check or try? Thanks in advance.


#2

how long does it take before the cell phone sees the hangup? Most normal POTS lines, when hung up, won’t hangup for a little while, maybe 20 seconds or so. At least that is how they used to be, can’t say I’ve tested it any time recently. This used to be to allow you to do things like hang up one phone, walk over to another room and pickup that line. (or at least it allowed this, whether or not it was ‘emant for that’ …)

anyhow - it was always the called party who could do this, so in effect the calling party was in control of keeping the line occupied for this duration if they did not hangup.

I’m wondering if this is what is happening? Have you tried putting a phone at the end of the phone line and trying the experiment, but after hanging up, pick it back up after several seconds and see if the line is stil live or not? If that is the case, I wonder if a call to Verizon could possibly change this?

anyhow - good luck,

p


#3

[quote=“p_lindheimer”]Most normal POTS lines, when hung up, won’t hangup for a little while, maybe 20 seconds or so. At least that is how they used to be, can’t say I’ve tested it any time recently. This used to be to allow you to do things like hang up one phone, walk over to another room and pickup that line. (or at least it allowed this, whether or not it was ‘emant for that’ …)[/quote] That’s actually the “problem”. I verified this against a regular phone with Asterisk disconnected, then went back with Asterisk connected.
Thanks lindheimer, I had not noticed this until now. I grew up in Germany, when you hang up there, well, you hang up and that’s that. This is more about expectations of the caller (you cut into my airtime kinda stuff) than anyhting so I will leave it as is.