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Overview

The

In an Access scenario, connections are on a per-subscriber-registration basis. The

the

A connection is deleted when the flow cannot reach the subscriber (example a broken TCP connection), when the connection is replaced by a newer one through successful modification, or when the registration is deleted.

For Peering, there are typically two connections, one for each direction. Connections to the peers are maintained and reused for all requests to the peer, independent of calls. The

The

• Reject incoming INVITE over UDP with PDU size greater than allowed configured size if enabled on ingress Trunk Group. However, the same INVITE is supported by

• the

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  , if it is received over TCP.
• Send out INVITE over TCP if outgoing INVITE size is more than the configured size enabled on the egress Trunk Group.

When TCP fallback feature is enabled it overrides any other configuration related to transport preference.

When a UE sends REGISTER request to the

The SIP Trunk Group flag clearTcpConnectionsforRegistration allows the

TCP Keep-alive

Timer 

The 

Examples

SIP Trunk Group Configuration

The following example sets the NAT keep-alive timer to 200 seconds for SIP over TCP.

% set addressContext default zone ZONE_IAD sipTrunkGroup SBX10_IAD services natTraversal tcpKeepaliveTimer 200
% commit

% show addressContext default zone ZONE_IAD sipTrunkGroup SBX10_IAD services
natTraversal {
    tcpKeepaliveTimer 200;
}  

For configuration details,

refer to SIP Trunk Group - Services (EMA) or

SIP Trunk Group - Services - CLI.

SIP Signaling Port Configuration

The following example sets tcpKeepaliveTime to 90 seconds, tcpKeepaliveInterval to 60 seconds and tcpKeepaliveProbes count to 2 for SIP Signaling Port 2:

% set addressContext default zone ZONE_SIPART_AS sipSigPort 2 tcpKeepaliveTime 90 tcpKeepaliveInterval 60 tcpKeepaliveProbes 2
% commit
 
% show details addressContext default zone ZONE_SIPART_AS sipSigPort 2
ipInterfaceGroupName      LIG2;
ipAddressV4               10.7.14.179;
portNumber                5060;
mode                      inService;
state                     enabled;
recorder                  disabled;
siprec                    disabled;
tcpConnectTimeout         5;
dscpValue                 0;
tlsProfileName            defaultTlsProfile;
transportProtocolsAllowed sip-tcp;
sctpProfileName           defaultSctpProfile;
tcpKeepaliveTime          90;
tcpKeepaliveInterval      60;
tcpKeepaliveProbes        2; 

For configuration details,

refer to Signaling Ports -

SIP Sig Port (EMA) or

Zone - SIP Sig Port - CLI.

TCP Media Port Ranges

The 

The two configurable fields/parameters under tcpPortRange include:

• baseServerPort – The starting (base) port number for the range of TCP ports to use for media. The baseServerPort range is 1-65534, or "none" (the default value which indicates

• the

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   does not apply this SIP trunk group control, and instead uses the tcpPortRange specified by system-wide settings.
• maxServerPort – The maximum TCP port number for the range of TCP ports to use for media. This value must be greater than the baseServerPort. The maxServerPort range is 1-65534, or "none" (the default value which indicates

• the

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   does not apply this SIP trunk group control, and instead uses the tcpPortRange specified by system-wide settings.

Each SIP trunk group can include a mediaIpAddress to indicate which IP address to use when allocating TCP media. The default value is 0.0.0.0 indicating that the system will function as it currently does by choosing an IP Address from the mediaIpInterfaceGroup. The mediaIpAddress can be configured as either an IPv4 or IPv6 address. Any media IP address configured must belong to the IP Interface Group configured as the mediaIpInterfaceGroup for the trunk group.

Use the CLI 'show table' command to view the ipInterfaceGroup table listing TCP (or UDP) port ranges marked (mediaPortRangeAssigned) or unmarked (mediaPortRangeUnassigned) for the indicated IP Interface Group.

For configuration details,

refer to:

• CLI:

• SIP Trunk Group - Media - CLI, Media System - CLI,

• Show Table Address Context
• EMA: SIP Trunk Group - Media, System - Media - Tcp Port Range,  Ip Interface Group - Media Port Range Assigned - All, Ip Interface Group - Media Port Range Unassigned - All