figure 1. "Edit Sip Trunk" form
In figure 1. "Edit Sip Trunk" form you can see an example configuration for creating a SECURE Inbound SIP Trunk. The mandatory fields are:
- NAME: a meaningful name for this trunk
- HOST: IP address of the SIP server provided by ITSP
- PORT: registration port of the service
- CONCURRENT CALLS: maximum number of calls on a single trunk
- DIRECTMEDIA: experimental sound management in P2P mode without routing the audio stream through the server
- SENDRPID: the Remote Party ID, used to interconnect with VoIP Provider for the management of privacy
- DTMFMODE: tone signaling technology used for this SIP interconnection
- ALLOW: voice codecs used in this trunk
- DISALLOW: voice codecs denied in this trunk
The default values for Port, Allow and Disallow are usually work well, however feel free to change them to suite your needs better.
Mandatory fields are:
- NAT: enable/disable the Network Address Translation configuration
- AUDIO TONES: this is used for Audio Messaging. The possible values are:
- NO AUDIO TONES: no audio messages would be played on this trunk
- ON EARLY MEDIA: the audio messages would be played using SIP early offer
- ON ANSWERED CALLS: the audio messages would be played using SIP delayed offer