[asterisk-users] OpenVox G400P network registration problems

[A J Stiles]

Is anybody intimately familiar with the OpenVox G400P card, or the Quectel M20 
RF modules fitted to it?  

I am having a strange network connectivity issue with just such a card, as 
follows:

The card was previously used with four O2 SIMs, and -- once I mastered 
creating message PDUs! -- worked beautifully, save for the fact that O2's 
definition of "unlimited" as in text messages turned out not to be the same as 
that found in the Oxford English Dictionary :(

Replacement SIM cards were duly ordered, and this is when the problem has 
manifested itself.

Span 1 will not register a T-Mobile SIM. Issuing AT+COPS=? shows only O2 and 
Vodafone available as operators on this span. Issuing the same command on any 
other span shows Orange, T-Mobile, O2 and Vodafone available. The SIM however 
worked properly in a mobile phone handset.  Performing "gsm power off 1", "gsm 
power off 2", swapping the SIMs between these spans and then performing "gsm 
power on 1" and "gsm power on 2" results in the recalcitrant SIM registering 
on span 2, and the SIM formerly from span 2 not registering on span 1.

I'm guessing the Quectel M20 GSM module on span 1 has got itself into a 
strange state; because it was also necessary to issue "gsm show span 1" to 
read the result of the last AT command (on other spans, the result appears in 
the Asterisk CLI). Do you know of a way of hard-resetting it? (The obvious 
"ATZ" does not work, neither does "gsm power off 1" followed by "gsm power on 
1").

Software versions:
Debian GNU/Linux 6.0.6
Asterisk 1.8.11-cert5
Dahdi 2.6.1+2.6.1
Chan_extra 2.0.5
(Yes, these are all a bit out-of-date; but they worked before.  All I did was 
swap over the SIM cards.)

-- 
AJS

Answers come *after* questions.