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:
In your PBX, instead of sip.commpeak.com, select two of the SIP proxy domains listed in your CommPeak portal (VoIP Services -> SIP Accounts -> Server Status) that are nearest to your location.
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=commpeakOn your extension, configure both trunks you created:
exten => _X.,1,Dial(SIP/commpeak-eu1/${EXTEN})
exten => _X.,n,Dial(SIP/commpeak-eu2/${EXTEN})