PJSIP multiple AOR: avoid calling other contacts when busy

[jmartin]

Dear all,

In a PJSIP endpoint with multiple contacts (same person), I want to allow only 1 simoultaneous incomming call. Then if a second incoming call takes place it should give BUSY until all contacts are available again.

I think that asterisk is configured in that way but if a contact is talking, if a second incoming call takes place… it’s prompted to the 2 available endpoints.

Endpoint/aor configuration

[200]
type=endpoint
…
device_state_busy_at=1

[200]
type=aor
max_contacts=3

Endpoint state when 1 call is in conversation:

CLI> pjsip show endpoints
…
Endpoint: 200/200 Busy 1 of 1
InAuth: auth200/200
Aor: 200 3
Contact: 200/sip:200@192.168.75.102:5060 0e932ab7ac Avail 5.895
Contact: 200/sip:200@192.168.75.223:5060 0f1a573da7 Avail 50.227
Contact: 200/sip:200@192.168.75.107:37716;line=2whm 244d03abd3 Avail 18.477
Transport: transport-udp udp 0 0 0.0.0.0:5060
Channel: PJSIP/200-0000002b/AppDial Up 01:03:52
Exten: CLCID: “Juan” <201>

When a second incoming call takes place:

-- Executing [start@sub-internal-call:6] Dial("PJSIP/203-00000033", "PJSIP/200/sip:200@192.168.75.102:5060&PJSIP/200/sip:200@192.168.75.223:5060&PJSIP/200/sip:200@192.168.75.107:37716;line=2whmin3h,59") in new stack
-- Called PJSIP/200/sip:200@192.168.75.102:5060
-- Called PJSIP/200/sip:200@192.168.75.223:5060
-- Called PJSIP/200/sip:200@192.168.75.107:37716;line=2whmin3h
-- PJSIP/200-00000034 connected line has changed. Saving it until answer for PJSIP/203-00000033
-- PJSIP/200-00000035 connected line has changed. Saving it until answer for PJSIP/203-00000033
-- PJSIP/200-00000036 connected line has changed. Saving it until answer for PJSIP/203-00000033
-- PJSIP/200-00000034 is ringing
-- PJSIP/200-00000036 is ringing

CLI> pjsip show endpoints
…
Endpoint: 200/200 Busy 3 of 1
InAuth: auth200/200
Aor: 200 3
Contact: 200/sip:200@192.168.75.102:5060 0e932ab7ac Avail 38.742
Contact: 200/sip:200@192.168.75.223:5060 0f1a573da7 Avail 210.295
Contact: 200/sip:200@192.168.75.107:37716;line=2whm 244d03abd3 Avail 106.935
Transport: transport-udp udp 0 0 0.0.0.0:5060
Channel: PJSIP/200-0000002b/AppDial Up 01:08:52
Exten: CLCID: “Juan” <201>
Channel: PJSIP/200-00000034/AppDial Ringing 00:00:13
Exten: start CLCID: “Rodrigo” <203>
Channel: PJSIP/200-00000036/AppDial Ringing 00:00:13
Exten: start CLCID: “Rodrigo” <203>

Conclusion

If the endpoint state is ‘Busy’ it should return busy when Dial attempts to call this endpoint.
It may be an issue but I’m new to pjsip and I really not sure of the right behaviour with multiple aors.

Can someone help me with this?

Thanks

[jcolp]

The option you mention is in regards to device state, not for dialling. You could use the DEVICE_STATE dialplan function[1] to check before dialling and act accordingly. There would still be a potential race condition where you check and they immediately go busy, but it would be minimal.

[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+16+Function_DEVICE_STATE

[jmartin]

Understood, fixed in dialplan as your suggestion. I can live with this race condition, probably it will never happen.

Thank you very much jcolp for pointing me in the right way.