If you already have an existing Asterisk PBX and want to combine it into a single system with 3CX, here is how to configure 3CX.
1. From the management console, choose the Bridge menu and add one by clicking Add Bridge
The bridge settings are explained as follows:
1. Virtual extension number. Enter a 5-digit gateway number. Please note that this number will be used as the “Bridge ID”, and it cannot be changed once created.
2. Name of bridge: a name for the bridge being created that identifies the bridge connection in the 3CX management console.
3. Type of bridge: set as “master”
4. Outbound rule prefix to reach the remote 3CX PBX.
5. Authentication password. By default an 8-digit alphanumeric password is generated, but it can be changed.
6. Assigned codecs. By default this is set to GSM-FR. Please remember that every codec chosen must also be supported by the Asterisk PBX.
7. Outbound rule, which must be created to identify outgoing calls to Asterisk.
Asterisk PBX settings
Create a Trunk with the following configuration
Trunk name : 3CX
Outgoing – PEER Details:
host=[3CX IP]
port=[3CX SIP Port]
username=[Bridge ID]
fromuser=[Bridge ID]
secret=[Bridge Password]
sendrpid=yes
qualify=yes
type=peer
Incoming – USER Details
host=[3CX IP]
port=[3CX SIP Port]
type=peer
trustrpid=yes
context=from-trunk
Register String
[Bridge ID]:[Bridge Password]@[3CX IP]:[3CX SIP Port]/[Bridge ID]
