AudioCodes MP-124 User Manual

SIP User's Manual 450 Document #: LTRT-65412
MP-11x & MP-124
10.2 NAT (Network Address Translation) Support
Network Address Translation (NAT) is a mechanism that maps a set of internal IP
addresses used within a private network to global IP addresses, providing transparent
routing to end hosts. The primary advantages of NAT include (1) Reduction in the number
of global IP addresses required in a private network (global IP addresses are only used to
connect to the Internet); (2) Better network security by hiding its internal architecture.
The following figure illustrates the device's supported NAT architecture.
Figure 10-1: Nat Functioning
The design of SIP creates a problem for VoIP traffic to pass through NAT. SIP uses IP
addresses and port numbers in its message body and the NAT server can’t modify SIP
messages and therefore, can’t change local to global addresses. Two different streams
traverse through NAT: signaling and media. A device (located behind a NAT) that initiates a
signaling path has problems in receiving incoming signaling responses (they are blocked by
the NAT server). Furthermore, the initiating device must notify the receiving device where to
send the media.
To resolve these issues, the following mechanisms are available:
 STUN (refer to ''STUN'' on page 450)
 First Incomin
g Packet Mechanism (refer to ''First Incoming Packet Mechanism'' on
page 451)
 RTP No
-Op packets according to the avt-rtp-noop draft (refer to ''No-Op Packets'' on
page 452)
For info
rmation on SNMP NAT traversal, refer to the Product Reference Manual.
10.2.1 STUN
Simple Traversal of UDP through NATs (STUN), based on RFC 3489 is a client / server
protocol that solves most of the NAT traversal problems. The STUN server operates in the
public Internet and the STUN clients are embedded in end-devices (located behind NAT).
STUN is used both for the signaling and the media streams. STUN works with many
existing NAT types and does not require any special behavior.
STUN enables the device to discover the presence (and types) of NATs and firewalls
located between it and the public Internet. It provides the device with the capability to
determine the public IP address and port allocated to it by the NAT. This information is later
embedded in outgoing SIP / SDP messages and enables remote SIP user agents to reach
the device. It also discovers the binding lifetime of the NAT (the refresh rate necessary to
keep NAT ‘Pinholes’ open).

AudioCodes MP-124 Specifications

General

Model	MP-124
Category	Gateway
Analog Ports	24 FXS
Ethernet Ports	2
Protocol Support	SIP, H.323
Fax Support	T.38, G.711 pass-through
Power Supply	100-240VAC, 50-60Hz
Operating Temperature	0°C to 40°C
Voice Codecs	G.711, G.729, G.723.1, G.726
Management	SNMP
Storage Temperature	-20°C to 70°C
Humidity	10% to 90%, non-condensing
Network Interface	10/100Base-T Ethernet

Summary

2 Configuration Concepts

2.1 Computer Requirements

Lists the necessary computer requirements for using the device's Web interface.

2.2 Accessing the Web Interface

Provides instructions on how to open and access the device's Web interface.

3 Web-Based Management

3.1 Getting Acquainted with the Web Interface

3.1.1 Computer Requirements

Lists the necessary computer requirements for using the device's Web interface.

3.1.2 Accessing the Web Interface

Provides instructions on how to open and access the device's Web interface.

3.1.5 Working with Configuration Pages

3.1.7 Working with Scenarios

3.3 Configuration Tab

3.3.1 Network Settings

Allows configuration of various networking parameters like IP settings, routing, and QoS.

3.3.1.1 Configuring the Multiple Interface Table

Configures logical network interfaces, IP addresses, VLAN IDs, and application types.

3.3.1.4 Configuring the IP Routing Table

3.3.1.5 Configuring the QoS Settings

3.3.2 Media Settings

3.3.3 Security Settings

Configures various security settings, including user accounts and firewall.

3.3.4 Protocol Configuration

Configures the device's SIP parameters, including enabling applications and protocol definitions.

3.3.4 Protocol Configuration

3.3.4.2 Protocol Definition

Configures the main SIP protocol parameters, including general and DTMF settings.

3.3.4.3 Proxies, IP Groups, and Registration

Configures SIP proxy servers, registration parameters, and IP Groups for call routing.

3.3.4.4 Coders and Profile Definitions

3.3.4.6 SAS Parameters

Configures the Stand-Alone Survivability (SAS) feature for telephony continuity.

3.3.4.7 Manipulation Tables

3.3.4.8 Routing Tables

Configures call routing rules, including general parameters and specific routing tables.

3.3.4.5 SIP Advanced Parameters

3.3.4.5.2 Configuring Supplementary Services

Configures parameters associated with supplementary services like Call Forward and Call Waiting.

3.3.4.6 SAS Parameters

3.3.4.6.1 Configuring Stand-Alone Survivability Parameters

Configures the Stand-Alone Survivability (SAS) feature for local backup during network failures.

3.3.4.6.2 Configuring the IP2IP Routing Table (SAS)

3.3.4.8 Routing Tables

3.3.4.8.1 Configuring General Routing Parameters

3.3.4.8.2 Configuring the Tel to IP Routing Table

Defines Tel-to-IP call routing rules based on IP address or FQDN.

3.3.4.8.3 Configuring the IP to Trunk Group Routing Table

3.3.4.9 Endpoint Settings

3.3.4.9.1 Configuring Authentication

Defines user name and password for authenticating each device port.

3.3.4.9.4 Configuring Call Forward

Allows forwarding (redirecting) IP-to-Tel calls to other ports or destinations.

3.3.4.9.5 Configuring Caller ID Permissions

3.3.4.9.6 Configuring Call Waiting

3.3.4.10 Configuring Endpoint Phone Numbers

3.3.4.11 Hunt Group

3.3.4.11.1 Configuring Hunt Group Settings

Configures Hunt Group IDs, assigns them to channels, and defines methods for call assignment.

3.4 Management Tab

3.4.1 Management Configuration

Configures the device's management parameters like settings, regional settings, and maintenance actions.

3.4.1.1 Configuring the Management Settings

3.4.1.3 Maintenance Actions

3.4.1.3.1 Resetting the Device

Remotely resets the device, with options to save configuration to flash memory.

3.4.1.3.2 Locking and Unlocking the Device

3.4.1.3.3 Saving Configuration

3.4.2 Software Update

3.4.2.1 Loading Auxiliary Files

3.4.2.2 Software Upgrade Wizard

Guides through upgrading the device's firmware (cmp file) and loading configuration files.

3.4.2.3 Backing Up and Restoring Configuration

Saves the current configuration as an ini file for backup or restores configuration from a saved ini file.

3.5 Status & Diagnostics Tab

3.5.1 Status & Diagnostics

Monitors device channels, Syslog messages, hardware/software info, and statistics.

3.5.1.1 Viewing the Device's Syslog Messages

3.5.1.6 Viewing Active Alarms

4.2 INI File Format

4.2.1 Format Rules

Details the rules for formatting ini file names and content.

4.2.2 Format of Individual Parameters

5.2 Securing EMS-Device Communication

5.2.1 Configuring IPSec

Details configuring the IPSec protocol for secure communication between EMS and the device.

5.2.2 Changing SSH Login Password

5.3 Adding the Device in EMS

5.4 Configuring Basic SIP Parameters

5.7 Provisioning E911/MLPP Parameters

5.9 Resetting the Device

5.10 Upgrading the Device's Software

6 Configuration Parameters Reference

6.1 Networking Parameters

Describes the device's networking parameters, including Ethernet and IP configurations.

6.1.1 Ethernet Parameters

6.1.2 Multiple IP Interfaces and VLANs Parameters

Describes IP network interfaces and VLAN parameters for configuring logical IP addresses.

6.1.3 Static Routing Parameters

6.1.4 Quality of Service Parameters

6.1.5 NAT and STUN Parameters

6.1.8 DHCP Parameters

6.1.10 Syslog Parameters

6.2 Web and Telnet Parameters

Describes the device's Web and Telnet parameters for remote access and management.

6.2.2 Web Parameters

6.3 Debugging and Diagnostics Parameters

Describes the device's debugging and diagnostic parameters.

6.3.1 General Parameters

6.3.2 CDR and Debug Parameters

Describes Call Detail Record (CDR) and debug parameters for call logging and troubleshooting.

6.4 Security Parameters

Describes the device's security parameters, including general settings, HTTPS, SRTP, TLS, and SSH.

6.4.1 General Parameters

6.4.2 HTTPS Parameters

Describes Secure Hypertext Transport Protocol (HTTPS) parameters for secure web access.

6.4.3 SRTP Parameters

6.4.4 TLS Parameters

Describes Transport Layer Security (TLS) parameters for secure connections.

6.4.5 SSH Parameters

Describes Secure Shell (SSH) parameters for strong authentication.

6.4.6 IPSec Parameters

Describes Internet Protocol security (IPSec) parameters for network security.

6.5 RADIUS Parameters

6.6 SNMP Parameters

6.7 SIP Configuration Parameters

Describes the device's SIP parameters, including general and advanced settings.

6.7.1 General SIP Parameters

Describes the general SIP parameters for session setup and management.

9.2 Stand-Alone Survivability (SAS) Feature

9.2.1 Configuring SAS

Configures the device to operate with SAS for telephony continuity during network failures.

9.2.2 Configuring Emergency Calls

Configures emergency number redirection to PSTN via the SAS agent.

9.4 Emergency Phone Number Services

9.4.1 Enhanced 911 Support

Supports the North American emergency telephone number system (E911) for routing calls to PSAP.

9.4.1.1 FXO Device Interworking SIP E911 Calls from Service Provider's IP Network to PSAP DID Lines

Details FXO device interworking SIP E911 calls from IP network to analog PSAP DID lines.

9.5 Fax and Modem Capabilities

9.5.1 Fax/Modem Operating Modes

9.5.2 Fax/Modem Transport Modes

Details supported transport modes for fax/modem, including T.38 relay and bypass.

9.5.2.1 T.38 Fax Relay Mode

9.5.2.1.1 Switching to T.38 Mode using SIP Re-INVITE

Negotiates T.38 capabilities using Re-INVITE messages upon fax signal detection.

9.5.2.1.2 Automatically Switching to T.38 Mode without SIP Re-INVITE

Switches to T.38 mode automatically upon fax signal detection without SIP Re-INVITE.

9.5.2.2 Fax/Modem Bypass Mode

9.5.2.3 Fax / Modem NSE Mode

9.5.3 V.34 Fax Support

9.5.3.1 Using Bypass Mechanism for V.34 Fax Transmission

Uses bypass mode for V.34 fax transmission to enable full speed utilization.

9.6 FXO Operating Modes

9.6.1 FXO Operations for IP-to-Tel Calls

Describes FXO operating modes for IP-to-Tel calls including One-stage and Two-stage dialing.

9.6.1.1 One-Stage Dialing

9.6.1.2 Two-Stage Dialing

9.6.2 FXO Operations for Tel-to-IP Calls

9.6.2.1 Automatic Dialing

Defines telephone numbers automatically dialed when a specific FXS or FXO port is used.

9.6.2.3 FXO Supplementary Services

9.6.3 Call Termination on FXO Devices

9.6.3.1 Calls Termination by PBX

Supports methods for identifying when a call has been terminated by the PBX.

9.6.3.2 Call Termination before Call Establishment

9.10 Configuring Alternative Routing (Based on Connectivity and QoS)

9.10.1 Alternative Routing Mechanism

Compares destination number prefixes to routing table entries for alternative route selection.

9.10.2 Determining the Availability of Destination IP Addresses

9.15 Working with Supplementary Services

9.15.1 Call Hold and Retrieve

Describes how to place a call on hold and retrieve it using hook-flash.

9.15.2 Call Pickup

9.15.3 Consultation Feature

9.15.4 Call Transfer

9.15.5 Call Forward

9.15.6 Call Waiting

9.15.7 Message Waiting Indication

9.15.8 Caller ID

9.15.9 Three-Way Conferencing

9.19 Establishing a Call between Two Devices

9.19.1 Dialing from Remote Extension (Phone at FXS)

9.19.2 Dialing from PBX Line or PSTN

9.19.5 FXS Gateway Configuration

9.19.6 FXO Gateway Configuration

10 Networking Capabilities

10.1 Ethernet Interface Configuration

10.2 NAT (Network Address Translation) Support

10.2.1 STUN

10.2.2 First Incoming Packet Mechanism

10.6 Simple Network Time Protocol Support

10.7 IP QoS via Differentiated Services (DiffServ)

10.8 Network Configuration

Configures up to 16 different IP addresses with associated VLANs using the Multiple Interface table.

10.8.1 Multiple Network Interfaces and VLANs

10.8.1.1 Overview of Multiple Interface Table

10.8.1.2 Columns of the Multiple Interface Table

10.8.1.4 Multiple Interface Table Configuration Summary and Guidelines

10.8.1.5 Troubleshooting the Multiple Interface Table

10.8.2 Routing Table

10.8.2.1 Routing Table Overview

10.8.2.2 Routing Table Columns

10.8.2.3 Routing Table Configuration Summary and Guidelines

10.8.2.4 Troubleshooting the Routing Table

10.8.3 Setting up the Device

12 Selected Technical Specifications

12.1 MP-11x Specifications

12.2 MP-124 Specifications