Sip Trunk; Media Relay Server Overview; Sip Trunk Nat Traversal - Toshiba IP edge General Description Manual

Features

SIP Trunk

continuously every three seconds or not sent as a station option. To answer a Ring Over
Busy call, the user can hold, transfer, or disconnect the existing call.
On Voice First calls to a busy telephone that has an idle DN, the caller will get busy tone.
The caller can then dial the digit
SIP Trunk
Session Initiation Protocol (SIP) is an application layer protocol used for establishing ses-
sions in an IP network. SIP trunks allow the IPedge system to get PRI-like services from
an Internet Telephony Service Provider using SIP.
A SIP Trunk allows an IPedge system to connect internal voice and private data traffic to
the outside public network (PSTN and public data) via IP.

Media Relay Server Overview

In a NAT environment use the NAT Traversal capability of the IPedge server (Release 1.3
and later) or a SIP ALG router along with the IPedge Media Relay Server (MRS).
The MRS is configured by defining the Public IP address of the IPedge server and the port
range to be used for calls. Each call requires two UDP ports for the audio streams (one
port RTP, one port RTCP).
Refer to the IPedge Install manual for Media Relay Sever setup instructions.

SIP Trunk NAT Traversal

In order to support SIP Trunking on R1.2 and earlier IPedge systems in a NAT environ-
ment, the router needs to support an enterprise grade SIP ALG (Application Layer Gate-
way). In Release 1.3 and later, the IPedge system can support SIP Trunking with routers
that do not have a SIP ALG.
When used behind a NAT firewall that does not support a SIP ALG, the IPedge server can still be
given a private IP address. The SIP Trunk NAT Traversal capability (Release 1.3 and later) along
with the MRS will allow the IPedge server to:
• Use it's internal Media Relay Server to route media packets between the WAN and the LAN
and
• Apply the correct IP address to SIP signaling messages so that when they are sent out though a
NAT firewall, the SIP Trunk service provider will be able to send responses to the correct IP
address.
Within the NAT router, port forwarding rules will need to be configured, and a range of
ports opened for the Media Relay Server.
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to cause the idle DN to Ring Over Busy.
IPedge General Description 03/16