I want to connect my PCBX Asterisk@Home with a PBX SIEMENS SIP v6.
So, when a phone connected to my Asterisk call a phone whose number is 1XX or 2XX, I want to transfer this call on my PBX SIEMENS.
When a phone connected to my PBX SIEMENS call a phone whose number is 3XX, I want to transfer this call on my Asterisk.
Is it possible? Must I create a trunk and what kind of trunk?..
Thanks for your help.