Configuring SIP Snooping SIP Snooping Configuration Guidelines
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 14-9
Configuring SIP Snooping TCP Ports
The SIP snooping feature allows the configuration of TCP ports. This allows the SIP snooping functions
to a list of TCP ports, SIP packets sent/received on the TCP ports will be snooped. A maximum of 8 TCP
ports can be configured on a switch.
To configure the Server listening TCP ports, use the sip-snooping TCP port as follows
-> sip-snooping tcp-port 5678 5051
The SIP Snooping TCP port configuration is used to snoop the SIP packets, when the SIP endpoints
switches from UDP to TCP to send SIP packets of more than 1300 bytes in size.
Configuring SIP Snooping UDP Ports
The SIP snooping feature allows the configuration of UDP ports. This allows the SIP snooping functions
to a list of UDP ports, SIP packets sent/received on the UDP ports will be snooped. A maximum of 8 UDP
ports can be configured on a switch.
To configure the Server listening UDP port, use the sip-snooping UDP port as follows
-> sip-snooping udp-port 5260 5060
This allows the SIP snooping functionality for the configured UDP ports only.
Configuring the SIP Control DSCP
To configure SIP control DSCP marking, use the sip-snooping sip-control command
-> sip-snooping sip-control dscp 40
This marks the SIP messages with the configured SIP control DSCP.
Configuring SOS Calls
The SIP snooping features allow the detection of emergency calls based on the “to” URI in the INVITE
message. Configuration allows up to 4 SOS call strings to be configured. The string must be the exact URI
to be matched in the ‘to” URI.
When a call is deemed to be a SOS call, a default DSCP of 46 (EF) is assigned for both RTP and RTCP
flows of that call. SOS-Call DSCP can be configured to any value.A non-configurable rate limiter of
128kbps is imposed for SOS-Call.
-> sip-snooping sos-call number “911” “2233”
By default, no SOS number is configured for SIP Snooping
Configuring SOS Call DSCP
To configure the SOS-Call RTP/RTCP DSCP Marking, use the sip-snooping sos-call command.
-> sip-snooping sos-call dscp 56
This marks the SOS-Call RTP/RTCP packets with the configured SOS call dscp.
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