Trunks

Trunks are used to connect your PBX to external VoIP systems or devices, enabling outbound and inbound call traffic between networks.

The PBX supports two types of VoIP trunks:

Register Trunk: A registration-based SIP trunk that requires authentication (SIP REGISTER) using a username and password. Typically used when connecting to a VoIP provider or another PBX that mandates user authentication.

Peer Trunk: An IP-based SIP trunk that does not require registration. Instead, it relies on IP address authentication for communication between two VoIP systems, such as between your PBX and a VoIP provider or another PBX.

Note: The configuration settings vary depending on the selected trunk type.

Register trunk

Basic Information

Active: Enable this option to activate the trunk for use in all applicable routes. This setting is enabled by default.

Provider Name: Assign a descriptive name to easily identify the trunk.

Trunk Type: Select Register to configure a registration-based trunk.

Username: Enter the username provided by the VoIP provider for trunk registration.

Password: Enter the corresponding password for trunk registration.

Authentication Name: Used for SIP authentication. In most cases, it is the same with the user name.

From User: All outgoing calls from the SIP trunk will use the From User (in this case the
account name for SIP Registration) in From Header of the SIP invite package.
Keep this field blank if not needed.

Hostname: Service provider’s hostname or IP address.

Port Number: Enter the port number used by the provider. The default SIP port is 5060.

Domain: VoIP provider’s server domain name. If the provider has no domain name, fill in
the IP address instead.

Caller ID: Define the Caller ID that will be displayed for outbound calls placed through this trunk.

Record Calls: Enable this option to allow recording of both inbound and outbound calls through this trunk.

ICE Support: Enable or disable ICE for NAT traversal support.

DTMF Mode: Set the method for transmitting DTMF tones. Auto mode is selected by default.

Transport Protocol: Choose the transport protocol (UDP, TCP, TLS, etc.). By default, UDP is selected, but this can be modified via the Transport settings.

Codecs

The Codecs tab allows you to manage which audio formats your PBX uses during SIP trunk calls. These codecs define how voice data is compressed and transmitted over the network.

Dialed Number Manipulation Rules

Prepend: Digits added before the number when a match is found.

Prefix: Digits removed from the dialed number when a match is found.

Pattern: The set of rules used to match dialed numbers.

Caller Id: Optional Caller ID number or pattern that must match for the rule to apply.

Peer trunk