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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 846
Alternative Network Address Types (ANAT)
In compliance with UC_APL_NET_0007 Alternative Network Address Types (ANAT) is supported.
When the RMX is configured for IPv4 and IPv6 Addressing, the addition of the sdp-anat option tag in the
SIP Require and SIP Supported headers allows a mixture of IPv4 and IPv6 addressing to be specified by
the Session Description Protocol (SDP).
For a full description of ANAT see IETF RFCs 4091 and 4092.
Guidelines
● BFCP over TCP is not supported in Ultra Secure Mode. It’s associated Content channel is not
available.
● BFCP over UDP is supported in Ultra Secure Mode.
● If the RMX is configured for both IPv4 and IPv6, IPv4 addressing is given preference when
establishing the connection.
● If an Outbound Proxy is configured, its transport type is used.
● If an Outbound Proxy is not configured, the SIP Server’s (Registrar) transport type is used.
The Outbound Proxy and the SIP Server must be configured with one type only either according to
the IP address type or according to the DNS Resolution type. However, if the RMX is configured for
IPv4&IPv6 then the SIP Contact field will contain both IPv4 and IPv6 addresses.
System Flag
The ANAT Protocol selection is controlled by the ANAT_IP_PROTOCOL System Flag.
To modify it, manually add it to system.cfg and set its value as described in Table 5-52.
Range: DISABLED, AUTO, PREFER_IPv4, PREFER_IPv6
Default:
If the ULTRA_SECURE_MODE System Flag is set to NO: DISABLED.
If the ULTRA_SECURE_MODE System Flag is set to YES: AUTO.
ANAT_IP_PROTOCOL System Flag Values for Dial in Dial out
Value Behavior - Dial in and Dial out
DISABLED sdp-anat does not appear in SIP headers and the SDP does not contain a mixture of
IPv4 and IPv6.
If an endpoint requests ANAT (sends the Require: sdp-anat tag) the RMX will accept
the call.
AUTO sdp-anat appears in SIP headers.
Dial in: The IP Version preference is according to the SDP priority.
Dial out: IPv4 is advertised first.
PREFER_IPv4 sdp-anat appears in SIP headers.
Dial in: IPv4 is the IP Version preference.
Dial out: IPv4 is advertised first.