AudioCodes Mediant 1000 User Manual page 418

Parameter
Media IP Version Preference
media-ip-version-preference
[IpProfile_MediaIPVersionPref
erence]
User's Manual

[0] Ignore = The call is maintained despite no media and is
released when signaling ends the call (i.e., SIP BYE).

[1] Disconnect = (Default) The device ends the call.

[2] Reroute = (SBC application only) The device ends the call and
searches the IP-to-IP Routing table for a matching rule and if
found, generates a new INVITE to the corresponding destination
(i.e., alternative routing). You can configure a routing rule whose
matching characteristics is explicitly for calls with broken RTP
connections. This is done using the Call Trigger parameter, as
described in Configuring SBC IP-to-IP Routing Rules on page
656.
Note:

The device can only detect a broken RTP connection if silence
compression is disabled for the RTP session.

If during a call the source IP address (from where the RTP
packets are received by the device) is changed without notifying
the device, the device rejects these RTP packets. To overcome
this, configure the DisconnectOnBrokenConnection parameter to
0. By this configuration, the device doesn't detect RTP packets
arriving from the original source IP address and switches (after
300 msec) to the RTP packets arriving from the new source IP
address.

The corresponding global parameter is
DisconnectOnBrokenConnection.
Defines the preferred RTP media IP addressing version for outgoing
SIP calls (according to RFC 4091 and RFC 4092). The RFCs
concern Alternative Network Address Types (ANAT) semantics in the
SDP to offer groups of network addresses (IPv4 and IPv6) and the IP
address version preference to establish the media stream. The IP
address is indicated in the "c=" field (Connection) of the SDP.

[0] Only IPv4 = (Default) SDP offer includes only IPv4 media IP
addresses.

[1] Only IPv6 = SDP offer includes only IPv6 media IP addresses.

[2] Prefer IPv4 = SDP offer includes IPv4 and IPv6 media IP
addresses, but the first (preferred) media is IPv4.

[3] Prefer IPv6 = SDP offer includes IPv4 and IPv6 media IP
addresses, but the first (preferred) media is IPv6.
To indicate ANAT support, the device uses the SIP Allow header or
to enforce ANAT it uses the Require header:
Require: sdp-anat
In the outgoing SDP, each 'm=' field is associated with an ANAT
group. This is done using the 'a=mid:' and 'a=group:ANAT' fields.
Each 'm=' field appears under a unique 'a=mid:' number, for
example:
a=mid:1
m=audio 63288 RTP/AVP 0 8 18 101
c=IN IP6 3000::290:8fff:fe40:3e21
The 'a=group:ANAT' field shows the 'm=' fields belonging to it, using
the number of the 'a=mid:' field. In addition, the ANAT group with the
preferred 'm=' fields appears first. For example, the preferred group
includes 'm=' fields under 'a=mid:1' and 'a=mid3':
a=group:ANAT 1 3
418
Mediant 1000B Gateway & E-SBC
Description
Document #: LTRT-27045