Ip Telephony Capabilities; Ip-To-Ip Routing (Sip Trunking); Answer Machine Detector (Amd) - AudioCodes Mediant 2000 User Manual

SIP User's Manual
7

IP Telephony Capabilities

This section describes the device's IP telephony capabilities.
7.1

IP-to-IP Routing (SIP Trunking)

The AudioCodes device supports IP-to-IP VoIP call routing (or SIP trunking). The device
enables Enterprises to seamlessly connect their IP-PBX to a SIP trunk provided by an
Internet Telephony Service Provider (ITSP). The Enterprise can communicate with the
PSTN through the ITSP, which interfaces directly with PSTN. Alternatively, the device can
also provide the interface with the PSTN.
At the same time, the device can also provide an interface with the traditional PSTN
network, enabling PSTN fallback in case of IP network failure. In addition, the device
supports multiple SIP trunks, whereby if a connection to one ITSP goes down, the call can
immediately be transferred to another ITSP. By allowing multiple SIP trunks where each
trunk is designated for a specific ITSP, the device can route calls to an ITSP, based on call
destination (e.g., country code).
Therefore, in addition to providing VoIP communication within an Enterpise's LAN, the
device allows the Enterprise to communicate outside of the corporate LAN, using SIP
trunking.
The device interfaces between the Enterprise's IP-PBX and ITSP, allowing SIP trunking
implementation by the Enterprise, for example, in the following scenarios:
VoIP between headquarters and remote offices
VoIP between Enterprise and PSTN via their ITSP
For a detailed explanation on configuring IP-to-IP call routing, refer to the document IP-to-IP
SIP Call Routing Application Note.
7.2

Answer Machine Detector (AMD)

Answering Machine Detection can be useful in automatic dialing applications. In some of
these applications, it is important to detect if a human voice or answering machine is
answering the call. Answering Machine Detection can be activated and de-activated only
after a channel is already open. The direction of the detection (PSTN or IP) can be
configured (using the parameter AMDDetectionDirection - refer to ''Media Server
Parameters'' on page 300), as well as the detector detection sensitivity using the parameter
AMDDetectionSensitivity - refer to ''Configuring the IPmedia Settings'' on page 76).
Upon every Answering Machine Detection activation, the device can send a SIP INFO
message to an Application server, notifying it of one of the following:
Human voice has been detected
Answering machine has been detected
Silence (i.e., no voice detected) has been detected
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7. IP Telephony Capabilities
November 2008