SIP Phone Context Parameter

The Phone-Context parameter is defined in RFC 3966 and is part of the URI scheme tel. The 2020 IMG supports the Phone Context parameter on the outgoing To/From headers in the SIP INVITE message. The Phone Context feature is configured in the SIP SGP Profile and is disabled by default. See below.

 

Call Flow

Below is Call Flow Diagram of the Phone Context Parameter being used in a call. Refer to the Call Trace below when viewing the Call Flow diagram.

CF_SIP_Phone_Context_Param.png

 

Call Trace Example

To View a Call Trace of the above Call Flow, Click HERE.

 

Configuration

The 'Phone Context' parameter is configured through the SIP SGP Profile. Below are steps to configure the IMG to output the Phone Context parameter in the SIP INVITE message.

 

Initial Configuration

The procedure below explains how to configure SIP Privacy on the 2020 IMG. Before configuring, the 2020 IMG must have an initial configuration created on it. Follow the Basic Configurations procedure before proceeding.

 

Create SIP Signaling Gateway Profile (SGP)

Create a SIP SGP object. Within the SIP SGP object, the Trusted and SIP Privacy fields can be configured. Once SIP SGP is configured, it can be associated with entities inside and outside of the trusted domain  

  1. Right Click on the Profiles object and select New SIP SGP. Change the SIP Profile ID to something other than ID:0. By doing this, the other fields within the SIP SGP object can now be modified.
  2. In the SIP SGP object enter a name in the SIP Profile Name field to identify this profile.
  3. To enable the Phone Context Support select from drop down menu where to include the Phone Context parameter. See screen capture below. SIP Phone context feature is by default set to disable.


    Include in To: Header - Include the Phone Context Parameter in the To: Header only.
    Include in From Header - Include the Phone Context Parameter in the From: Header only.
    Include in both To: and From: Headers - Include the Phone Context Parameter in both the To: and From: Headers.

  1. Click in the Phone Context String field and enter a Phone Context String. Max number of characters is 64. Below are a few examples:

Digit String = 1508862

Domain Name = hyannis.dialogic.com

 

Once the Phone context parameters are entered into the Phone Context fields then the SIP SGP Profile will be available in the SIP Signaling and External Gateway objects. Refer to SIP SGP for more information.

 

Create SIP signaling stack

  1. Right Click on 2020 IMG Name and select New Signaling. The Signaling Object allows multiple signaling objects to be configured below it. No configuration is needed in this object.

  2. Right Click on Signaling Object just created and select New SIP. Select the SIP Gateway Profile just created from drop down menu in the Remote IMG’s SIP Profile field. See screen capture below.

    SC_PhoneContextParam_Config.png

    For more Information refer to SIP Signaling

 

Create an External Network Element

Configure an external gateway and add the SIP SGP profile to it.

  1. Right Click on Dialogic IMG EMS and select New External Network Elements. The External Network Elements object allows multiple external network element objects to be created under it. There is no configuration required in this object. Refer to the External Network Elements topic for more information.

  2. Right Click on External Network Elements object and select New External Gateways. The External Gateways object allows multiple gateway objects to be created under it. There is no configuration required in this object. Refer to the External Gateways topic for more information.

  3. Right Click on External Gateways object and select New External Gateway. See screen capture below.

    SC_PhoneContextParam_GW_Config.png

Refer to External Gateway for more information on configuring the External Gateway object.

 

 Create SIP Channel Group

  1. Right Click on Dialogic IMG EMS and select New Routing Configuration. See Routing Configuration for more information.

  2. Right Click on Routing Configuration and select New Channel Groups. The Channel Groups object allows multiple channel groups to be created under it. There is no configuration required in this object.

  3. Right Click on Channel Groups object and select New Channel Group. Enter a name to identify this channel group and change the Signaling Type to SIP using the drop down menu. See SIP Channel Group for more information on configuring a SIP channel group.

 

Insert SIP External Network Element into SIP Channel Group

  1. Right Click on SIP Channel group and select New IP Network Element. Select the Gateway configured earlier from the drop down menu in the IP Network Element field.

 

Additional Information