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MSRP session setup is similar to audio and video sessions. For details,

% set addressContext <addressContextName> zone <zoneName> sipTrunkGroup <trunkGroupName> media sourceAddressFiltering <enabled | disabled>

See

% set system media tcpPortRange {1024..65535}

See Media System - CLI for configuration details.

DSCP Marking for MSRP Packets

Differentiated Services Code Point (DSCP) is an IP packet field that enables different levels of service to be assigned to network traffic. DSCP is the combination of IP Precedence and Type of Service fields. The

% set profiles media packetServiceProfile <profileName> qosValues msrpDscp <value to be set>

See Packet Service Profile - CLI or Media Profiles - Packet Service Profile (EMA) for configuration details.

Reserving Interface Bandwidth

MSRP traffic can consume significant bandwidth depending upon the application. For example, a UA that wishes to transfer a file using MSRP can potentially use up significant amount of bandwidth as compared to a UA that uses MSRP to send an instant message. To limit bandwidth usage, reserve a percentage of bandwidth across all physical interfaces using the following CLI command. The default value is "0" %.

% set system media dedicatedBWForNonRTPMedia <0...50>

For default values, the bandwidth available for RTP traffic across all interfaces will continue to be 95%, MSRP shares the 5% remaining bandwidth with signaling. This is suitable only when the expected bandwidth usage for MSRP is minimal and not expected to grow any larger.

Ideally, a percentage of the interface should be reserved for MSRP by setting a non-zero value. This will accordingly reduce the available bandwidth for RTP from 95%. However, this will guarantee that aggregate MSRP traffic usage does not exceed the reserved bandwidth, thereby not interfering with RTP or Signaling.

See Media System - CLI for configuration details.

MSRP Call Admission Control

The number of active MSRP sessions allowed on the

% set addressContext <addressContextName> zone <zoneName> sipTrunkGroup <trunkGroupName> cac tcpMediaLimit <0...5000>

See 

To configure MSRP for Direct Media, do the following:

1. Enable the Direct Media flag in the Packet Service Profiles. If using different packet service profiles on both legs of the call, enable Direct Media on both packet service profiles. For example:

   Code Block
   language none
   % set profiles media packetServiceProfile PUBLIC_leg flags useDirectMedia enable % set profiles media packetServiceProfile PRIVATE_leg flags useDirectMedia enable

2. Enable the Direct Media control flag on the SIP trunk groups used for both legs of the MSRP session. For example:

   Code Block
   language none
   % set addressContext default zone PUBLIC sipTrunkGroup PUBLIC_TG media directMediaAllowed enabled % set addressContext default zone PRIVATE sipTrunkGroup PRIVATE_TG media directMediaAllowed enabled

See following pages for configuration details:

• CLI: Packet Service Profile - CLI and

CLI Example:

> show status global callMediaStatus
    callMediaStatus 786432 {
    mediaStreamsInCall                         audio,TCP/MSRP/CHAT;
     :
    mediaStream3Label                          TCP/MSRP/CHAT;
    ingressMediaStream3OctetsSent              136;
    ingressMediaStream3OctetsReceived          136;
    egressMediaStream3OctetsSent               136;
    egressMediaStream3OctetsReceived           136;
    egressMediaStream3TcpRole                  server;
    ingressMediaStream3TcpRole                 server;
 
> show status global callDetailStatus
    callDetailStatus 786432 {
    mediaStreams                        audio,TCP/MSRP/CHAT;
    :
    ingressMediaStream3LocalIpSockAddr  "10.7.16.108/ 2000";
    ingressMediaStream3RemoteIpSockAddr "10.7.6.40/ 42580";
    egressMediaStream3LocalIpSockAddr   "10.7.16.109/ 2000";
    egressMediaStream3RemoteIpSockAddr  "10.7.6.40/ 42579"; 

See