Mediant SBC Configuration

Setting up the IP Group that communicates with the QMS server requires creating a Proxy Set and its associated IP Group. A Proxy Set defines the address (IP address or FQDN) and transport type of a SIP server.

Proxy Set Detail

IP Group Detail (partial)

There is one pertinent SIP Recordings settings at SIP Recording → SIP Recording Settings. The SIP Recording Metadata Format should be set to RFC 7865.

Sip Recording Rules are created to qualify a subset of call traffic for recording, a recording rule defines a call route that should be recorded. A SIP Recording Rule names two IP Groups that serve as the SIP endpoints for the call, and a third IP Group that names the location of the Call Recorder, the QMS installation in this case. Generally, a SIP Recording Rule says if a call traverses the SBC between IP Group A and IP Group B record the call at IP Group C. To create a recording rule:

Message Manipulations are rules that describe transformations that are applied to SIP messages. Individual manipulations are assigned to a group of sequenced manipulations by assigning each manipulation in the group a common Manipulation Set ID. Finally, these groups of manipulation rules are assigned to IP Groups to treat either messages arriving at that IP Group or messages being sent from that IP Group. In this case message manipulations are used to allow select SIP header to be copied from the SIP Invites that establish calls we intend to record to the SIP Invites sent to the QMS recorder. The headers are attached as new non-standard headers on the Invites sent to the QMS recorder and are used by QMS to gather metadata for the call, for example whether the call was inbound or outbound with respect to a user. Two Message Manipulation sets are required, the first set persists the headers we are interested in from any Invite that is inbound or outbound to an IP Group named as a Recorded or Peer IP Group in any of the recording rules we define. The second manipulation set takes these persisted headers and appends them to any Invite bound for the IP Group that names the QMS recorder. There are four headers that will be treated by these two rule sets, To, From, Remote-Party-ID and Diversion.

Create a new message manipulation by selecting Message Manipulation → Message Manipulations → New. First, create the 4 rules to persist the 4 headers of interest; To, From, Remote-Party-ID and Diversion. The Manipulation Set ID will be the same for all 4 persistence rules, the Message Type will be Invite.Request for each, and the Action Type will be Modify for each. The Name, Condition, Action Subject and Action Value will differ for each rule. These values are set as follows:

Persist To Header Rule

Next, create the 4 rules to attach the 4 persisted headers to the Invite bound for the QMS recorder. The Manipulation Set ID will be the same for all 4 attachment rules, the Message Type will be Invite.Request for each and the Action Type will be Add for each. The Name, Condition, Action Subject and Action Value will differ for each rule. These values are set as follows:

Attach To Header Rule

The Message Manipulation set will look similar to this, note there are 4 persistence rules all with Manipulation Set ID 10 and 4 attachment rules all with Manipulation Set ID 11.

Finally, the Manipulation Set IDs, 10 and 11 in this example need to be assigned to IP Groups. The Manipulation Set ID of the persistence group is assigned as the inbound and outbound manipulation set on any IP Group appearing as a Recorded or Peer IP Group in any SIP Recording Rule. The Manipulation Set ID of the attachment group is assigned as the outbound manipulation set on the IP Group naming the QMS recorder.

Select Core Entities → IP Groups, select an entry in the table and click edit to assign manipulation sets.

If the QMS recorder will be setup to create dual channel recordings QMS requires knowing which IP group triggered a particular recording. The name of a triggering IP group is the SIP Group Name configured on the IP Group named as the Recorded IP Group of the SIP Recording Rule that triggered a recording. Many triggering IP groups can be named in a comma separated list. The triggering IP groups can be sent to QMS on a per call basis using a Message Manipulation or can be set on a per installation basis in the configuration of a QMS CallRecording service that’s recording the call.

To administer the setting at the CallRecording service edit the service configuration file for the CallRecordingService.exe in the QMS installation folder. Add the SiprecMediantSBCTriggeringGroupname tag naming any triggering IP groups. In the example below two groups are named.

To administer the setting from the SBC using a Message Manipulation create a new Message Manipulation with the same Manipulation Set ID as the attachment Manipulations defined above. The details of the Manipulation follow where enghouse.com and 10.1.1.20 are named as triggering groups.

There are a handful of settings applicable to the Mediant SBC that can be set to remedy observed deficiencies in certain call scenarios. These scenarios would typically be identified and the settings tuned by QMS support personnel.