[asterisk-users] PJSIP device_state_busy_at, how does this work?

Joshua C. Colp jcolp at sangoma.com
Thu Nov 28 08:41:11 CST 2019

On Thu, Nov 28, 2019 at 10:32 AM Benoit Panizzon <benoit.panizzon at imp.ch>

> Hi Gang
> According to:
> https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Configuration_res_pjsip#Asterisk12Configuration_res_pjsip-endpoint_device_state_busy_at
> And endpoint should return busy if this number is reached.
> We have PBX Trunks registering to the Asterisk.
> So we want to limit the number of concurrent calls to a PBX and return
> busy, if more than the configured number of channels are in use.
> I set for example:
> device_state_busy_at=4 to limit the trunk to 4 channels so 400kbit/s
> can be assured by QOS measure.
> But when testing, I noticed caller don't get busy.
> pjsip show endpoints happily shows 5 of 4 channels in use.
> Do I have to query the device state from the dialplan and manually
> return busy?

The option strictly controls device state. Any enforcement of a limit for
calling does not exist, and is up to you to do using various methods.
Device state could be queried and used, or GROUP[1] and GROUP_COUNT[2].

[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+17+Function_GROUP

Joshua C. Colp
Senior Software Developer
Sangoma Technologies
Check us out at www.sangoma.com
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