User:Uplink

Notes on Asterisk

modules.conf

With autoload=yes, modules are loaded in scandir order, which means symbols aren't always available. Asterisk will re-attempt the loading of the failed modules once, but I've encountered a case where this failed too. So I ended up with no Gosub app... because app_stack.so failed to load.

Fixed it by adding these lines to modules.conf:

preload => res_speech.so
preload => res_agi.so

res_agi.so needs a symbol from res_speech.so, that's why they're both in there.

Asterisk could really do a better job here, because the results are voodoo.

iptables

You don't need to open a gaping hole in your firewall for RTP. You can let iptables do the translation and tracking, like it's supposed to:

modprobe nf_conntrack_sip sip_direct_signalling=0 sip_direct_media=0
modprobe nf_nat_sip

SCCP

sccp-chan-b can do [nasty things] to your computer. It froze mine twice in two days once I got it working. Meanwhile, I updated it to V4.0.0 STABLE, and now the result seems to be just crashing my Asterisk. Better than a frozen machine, right? :)

Soon after writing this page, I upgraded to the latest trunk (V4.1, revision 3787), and the crash doesn't happen anymore. Good enough case to use it.

autofallthrough

Dianemo's dialplans, coming from the old days, rely on autofallthrough=no.

The easiest way to set this is to create a file called /etc/asterisk/extensions.d/fallthrough.conf with the following content:

[general]
autofallthrough=no

Files to keep when blasting /etc/asterisk to get a clean new one

• extensions.d/fallthrough.conf
• manager.d/*.conf

Everything else can be obliterated safely :)