Configuring SIP Snooping SIP Snooping Limitations
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 14-15
SIP Snooping Limitations
• Media types other than audio and video as application, image media types etc. are not supported.
• Solution only supports SIP, no support of NOE (New Office Environment).
• SIP Registrar, outbound proxy, proxy, redirect functions should be provided by the same server called
the SIP Server.
• All initial SIP messages between User Agents must go through the SIP Server. Direct SIP session
establishment between end users will be not supported.
• Outbound proxy configured on phone and trusted call server configured on switch must be the same.
• Only SIP over UDP and SIP over UDP/TCP is supported. Solution does not support SIP over SCTP or
MPLS and SIP over TLS.
• Encrypted RTCP or SDP is not supported.
• Only SIP over IPv4 is supported, no support for IPV6.
• Multicast Media Sessions by SIP is not supported
• Only RTP or RTP profile AVP is supported to carry media. SAVP, AVPF, SAVPF are not supported.
• Only IP address is supported. DNS resolution and FQDN name are not supported in SDP
• Only audio and video application in "m" line of SDP is supported.
• No network performance reporting other than RTCP reports.
• RTCP port assignment is taken as one higher than corresponding RTP. Other methods for RTCP port
assignment is not supported
• Media quality metrics displayed to the user only convey the presence of problem in voice and video
transmission quality. Exact location and device responsible for it will not be known and it is expected
that the user will find it by other means and take corrective action.
• QOS SIP policy modifications should be applied for the new calls only and not for existing ones.
• DSCP marking will be done for only [(64 * TCAM Slice Value)-4] SIP audio calls, if a call is through
linkagg on a stack.
• No VRF awareness. Similarly, NAT transversal (ICE, TURN, STUN solution) is not supported.
• Emergency call identification is based on user configured string. Usage of priority or resource-priority
header is not considered.
• SIP IP address and RTP IP address of end point at edge port must be same, otherwise TCAM entries
will not be created.
• Media that flows before TCAM entries are installed does not get configured QOS treatment.
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