Sip Trunk Example Configuration

To allow the SBC to function as a PBX a SIP trunk to allow the SBC to route calls to the PSTN is needed. In this example we are connecting to a SIP Trunk to a CUCM that has PSTN access.

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 = “CUCM”
GENERAL -> Network Interface = “Linked to the Internal LAN” (In our example this is Eth0,
GENERAL -> UDP Port = “0” (In our example we are not using UDP so set port to 0)
GENERAL -> TCP Port = “Port required” (In our example we are using TCP port 5060, 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 and you can not have a clash with PW for example. In our case PW was using UDP 5060 so no clash.)
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 a 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 HOLD -> Remote Hold Format = Hold And Retrieve Not Supported
SBC HOLD -> Play Held Tone = Internal

MEDIA -> Broken Connection Mode = Ignore

LOCAL TONES -> Local Ringback Tone Index 1

LOCAL TONES -> Local Held Tone Index 1

Add a new proxy set

Browse to “Setup > Signaling & Media > Core Entities > Proxy Sets” and click “New”

The settings we are concerned with are:

GENERAL -> Name = “Any Name”

GENERAL -> SBC IPv4 Interface  = “ Link to SIP interface created previously”

KEEP ALIVE -> Proxy Keep Alive = “OPTIONS”

KEEP ALIVE -> Proxy Keep Alive Time = “300” (5 minutes)

Need to add Proxy addresses for all nodes in the SIP trunk target in our case the publisher and subscriber of CUCM. This is done via link in bottom left of screen Proxy Address 2 items >>

PROXY ADDRESS = 10.221.8.133:5060

TYPE = TCP

PROXY ADDRESS = 10.221.9.133:5060

TYPE = TCP

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 = Server

GENERAL -> IP Profile = “Linked to the New IP Profile created previously”

GENERAL -> Proxy Set = “Linked to the New Proxy Set created previously”

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