Dial Pattern for 3rd-Party PBXs

If you have your own PBX and a CommPeak SIP account, you need to create a trunk with CommPeak using your CommPeak SIP account credentials in order to avoid connection issues. 

Please follow these recommendations:

1. In your PBX, instead ofsip.commpeak.com, select two of the following SIP proxy domains that are nearest to your location:
   
   useast.sip.commpeak.com
   uswest.sip.commpeak.com
   br.sip.commpeak.com
   au.sip.commpeak.com
   sg.sip.commpeak.com
   tw.sip.commpeak.com
   eu1.sip.commpeak.com
   eu2.sip.commpeak.com
   
   
2. Configure each of the two selected trunks (e.g. eu1 and eu2) following this example:
   
   [commpeak-eu1]
   host=eu1.sip.commpeak.com
   type=peer
   qualify=yes
   disallow=all
   
   If you want to change the codec priority, place ulaw before g729:
   
   allow=g729
   allow=ulaw
   
   If username/password authentication was chosen:
   
   username=username
   secret=password
   context=commpeak
   
   
3. On your extension, configure both trunks you created:
   
   exten => _X.,1,Dial(SIP/commpeak-eu1/${EXTEN})
   exten => _X.,n,Dial(SIP/commpeak-eu2/${EXTEN})