Remote BLF's using PJSIP

This page will outline how to setup remote phone BLF's  using PJSIP between two PBX's which will monitor the device state of remote phones.

Asterisk Background

Publishing Extension States

Exchanging Device State PJSIP

Environment

Set BLF's on Phones

BLF Alerts

Create a context=from-internal trunk on each PBX to route calls and to send the PUBLISH for device-states

FreePBX 

PBXact

FreePBX Config

1. Edit the pjsip.endpoint_custom.conf by adding the following data

   [PBXact]
   type=endpoint
    
   [PBXact-devicestate]
   type=outbound-publish
   server_uri=sip:FreePBX@10.39.96.5
   event=asterisk-devicestate
   @body=application/dialog-info+xml
   @context=^users
    
   [PBXact]
   type=asterisk-publication
   devicestate_publish=PBXact-devicestate
   mailboxstate_publish=PBXact-mwi
   device_state=yes
   mailbox_state=yes
   @body=application/dialog-info+xml
   @context=^users
    
    
   [PBXact]
   type=inbound-publication
   event_asterisk-devicestate=PBXact
   event_asterisk-mwi=PBXact

2. Edit the extensions_custom.conf

   [from-internal-custom]
   exten => _[47]xxx,hint,PJSIP/${EXTEN}&PJSIP/90${EXTEN}&PJSIP/99${EXTEN}&Custom:DND${EXTEN},CustomPresence:${EXTEN}                 ; *** note that the dialplan is looking for extensions in the range of 4xxx or 7xxx

PBXAct Config

1. Edit the pjsip.endpoint_custom.conf by adding the following data
   

   [FreePBX]
   type=endpoint
    
   [FreePBX-devicestate]
   type=outbound-publish
   server_uri=sip:PBXact@10.39.96.4:5061
   event=asterisk-devicestate
   @body=application/dialog-info+xml
   @context=^users
    
   [FreePBX]
   type=asterisk-publication
   devicestate_publish=FreePBX-devicestate
   mailboxstate_publish=FreePBX-mwi
   device_state=yes
   mailbox_state=yes
   @body=application/dialog-info+xml
   @context=^users
    
   [FreePBX]
   type=inbound-publication
   event_asterisk-devicestate=FreePBX
   event_asterisk-mwi=FreePBX

2. Edit the extensions_custom.conf

   [from-internal-custom]
   exten => _[123]xxx,hint,PJSIP/${EXTEN}&&PJSIP/90${EXTEN}&PJSIP/99${EXTEN}&Custom:DND${EXTEN},CustomPresence:${EXTEN}               ; *****note that the dialplan is looking for extensions in the range of 1xxx, 2xxx or 3xxx

To show hints from each PBX respectively you may enter the following

1. From the PBX CLI from the FreePBX: asterisk -rx 'core show hints'|grep -i (ext)

   

   As you can see, FreePBX instance is watching extensions 7200 and 4100 from PBXact
   When the user is on a call, BLF will change as well as the hint
   

   

2. DND can also be monitored as well