Configuration of SBC as a PBX

To allow the SBC to function as a PBX and allow the BT Trade TPO to register to the SBC we need to add the below configuration.

Add a new SIP interface

browse to “Setup > Signaling & Media > Core Entities > SIP Interfaces” and click “New”

The settings we are concerned with are:
 
GENERAL -> Name = “Any Name”
GENERAL -> Network Interface = “Linked to the Internal LAN” (In our example this is Eth0,
GENERAL -> UDP Port = “Port required” (In our example we are not using UDP so set the port to 0)
GENERAL -> TCP Port = “Port required” (In our example we are using TCP port 5080, you need to use a unique port number which has not already been linked to the “Network Interface”, since this is the Listening Port that you are setting on that Interface.)
GENERAL -> TLS Port = “Port required” (In our example we are not using TLS so set the port to 0)

 
Note: “Topology Location” which is set as “Down” in this example, this tells the SBC in what view to place this entity when viewing the TOPOLOGY VIEW and so it’s important to ensure you select the correct one to accurately update the topology view.

Add an new IP profile

Browse to “Setup > Signaling & Media > IP Profiles” and click “New”

The settings we are concerned with are:
 
GENERAL -> Name = “Any Name”

SBC FORWARD AND TRANSFER -> Remote REFER Mode = Handle Locally
SBC FORWARD AND TRANSFER -> Remote 3xx Mode = Handle Locally

SBC FORWARD AND TRANSFER-> Send Header for Transfer= Remote=Party-ID

 
SBC HOLD -> Remote Hold Format = Hold And Retrieve Not Supported
SBC HOLD -> Play Held Tone = Internal
 

 We need to upload the pre-recorded tones file to the below location.

Coders

MEDIA -> Broken Connection Mode = Ignore

If you do want to have broken connection then choose a value larger than that of the TPO RTP or Carrier timers.

Add a new IP group

Browse to “Setup > Signaling & Media > Core Entities > IP Groups” and click “New”

The settings we are concerned with are:

GENERAL -> Name = “Any Name”

GENERAL -> Type = User (This one is important as this allows the TPO to Register on the SBC)

GENERAL -> IP Profile = “Linked to the New IP Profile created in Step 2”

GENERAL -> Media Realm “Linked to a Media Realm of Choice” (Here we just reuse the existing one for “IP-PBX” but a new one can be created if desired and linked here)

SBC GENERAL -> Classify By Proxy Set = Disabled (We are not linking to any Proxy here since the SBC will be the Proxy (PBX), also why we don’t create a Proxy Set either)

Add a new classification

Since we will register the extensions there is no proxy set used for this type of IP Group so we need to create a classification so SBC can route calls.

Browse to “Setup > Signaling & Media > SBC > Classification” and click “New”

The settings we are concerned with are:

MATCH -> Name = “Any Name”

MATCH -> Source SIP Interface = “Linked to the New SIP Interface created in Step 1”

ACTION -> Source IP Group = “Linked to the New IP Group created in Step 3”