AudioCodes Mediant 1000B - Page 446

User's Manual 446 Document #: LTRT-27055
Mediant 1000B Gateway & E-SBC
Parameter Description
and the Redirect server replies with a SIP 3xx response to a PBX in
the LAN in the Contact header. If the device sends this response as
is (i.e., with the original Contact header), the FEU is unable to reach
the new destination.
 [0] Transparent = (Default) The device forwards the received SIP
3xx response as is, without changing the Contact header
(i.e.,transparent handling).
 [1] Database URL = The device changes the Contact header so
that the re-route request is sent through the device. The device
changes the URI in the Contact header of the received SIP 3xx
response to its own URI and adds a special user prefix
("T~&R_”), which is then sent to the FEU. The FEU then sends a
new INVITE to the device, which the device then sends to the
correct destination.
 [2] Handle Locally = The device handles SIP 3xx responses on
behalf of the dialog-initiating UA and retries the request (e.g.,
INVITE) using one or more alternative URIs included in the 3xx
response. The device sends the new request to the alternative
destination according to the IP-to-IP Routing table (the 'Call
Trigger' field must be set to 3xx).
Note:
 When the parameter is changed from 1 to 0, new 3xx Contact
headers remain unchanged. However, requests with the special
prefix continue using the device's database to locate the new
destination.
 Only one database entry is supported for the same host, port, and
transport combination. For example, the following URLs cannot
be distinguished by the device:

sip:10.10.10.10:5060;transport=tcp;param=a

sip:10.10.10.10:5060;transport=tcp;param=b
 The database entry expires two hours after the last use.
 The maximum number of destinations (i.e., database entries) is
50.
 The corresponding global parameter is SBC3xxBehavior.
SBC Hold
Remote Hold Format
remote-hold-Format
[IPProfile_SBCRemoteHoldFo
rmat]
Defines the format of the SDP in the SIP re-INVITE (UPDATE) for
call hold that the device sends to the held party.
 [0] Transparent = (Default) Device forwards SDP as is.
 [1] Send Only = Device sends SDP with 'a=sendonly'.
 [2] Send Only Zero ip = Device sends SDP with 'a=sendonly' and
'c=0.0.0.0'.
 [3] Inactive = Device sends SDP with 'a=inactive'.
 [4] Inactive Zero ip = Device sends SDP with 'a=inactive' and
'c=0.0.0.0'.
 [5] Not Supported = This option can be used when the remote
side does not support call hold. The device terminates call hold
requests received on the leg interfacing with the initiator of the
call hold, and replies to this initiator with a SIP 200 OK response.
However, call retrieve (resume) requests received from the
initiator are forwarded to the remote side. The device can play a
held tone to the held party if the 'SBC Play Held Tone' parameter
is set to Yes.