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System Administration Guide

300 Main Street • East Rochester, NY 14445 • Toll Free 1-866-ALLWORX • 585-421-3850 • www.allworx.com

Revised: March 28, 2007

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7 SIP Proxies and SIP Gateways

Note: This is an optional feature that requires a feature key. The necessary key is referred to as the Internet

Call Access Feature Key.

7.1 Introduction

The Allworx server products support connectivity to external SIP compliant devices such as SIP proxy

servers and SIP gateways. The Allworx products make an administrative distinction between four specific

classes of SIP devices based on their typical functional use scenarios and how they interact with the Allworx

system:

 SIP Proxy

– An external SIP server that typically requires registration/authentication and is logically

treated as an external service for routing calls. For example, when you desire to place calls through an

Internet Telephony Service Provider (ITSP), you need to define a new SIP proxy to communicate with

that external service. Typically, you reach SIP proxies through the Internet or through wide area

network (WAN). A key distinction of a SIP Proxy in Allworx terms is that it is a device or server that the

Allworx server will register with.

 SIP Gateway

– Allworx defines a SIP Gateway to be a SIP compatible device that extends the

connectivity of the Allworx PBX. For example, you might configure a SIP gateway to attach a FXO, FXS

or T1 expander gateway. Typically SIP gateways are local devices that you implicitly trust and have

them connected via an Ethernet interface directly to the same LAN that the Allworx server is connected

to. SIP Gateways are expected to register with the Allworx server.

 SIP Handsets

– A SIP compatible handset (telephone) that registers with the Allworx server.

Attachment and configuration of SIP handsets is discussed in another section and does not require the

advanced optional feature key needed for accessing SIP Gateways and Proxies. See Adding Handsets

section for information about connecting to Allworx IP phones or other 3

party SIP handsets.

 Remote Allworx

– A remote peer system that is another Allworx system. The remote system does not

have to be the same model as the local Allworx system, but typically they should be running the same

version of software, if possible.

SIP Gateways and SIP proxies are distinctly defined, but are configured in a very similar manner. Both types

of devices are added to the system through the Phone System / Outside Lines page.

7.2 Configuration

Configuration of SIP Proxies and Gateways is very straight forward, although there are several possible

customization parameters to help deal with different types of devices that may either not be fully compliant

with the SIP standards or comply with an older version of the standard.

For example, to define a new SIP Proxy connection on the Allworx

server so it can access an Internet

Telephony Service Provider (ITSP) to provide support for dialing and receiving outside calls you need to go to

the Phone System / Outside Lines page. In the SIP Proxies section, you will see a list of all the SIP Proxies

you have already configured. To configure a new SIP Proxy, click the Add a New SIP Proxy link that will

present a page of many parameters that need to be defined for the ITSP service.

The technique for creating a new gateway is very similar to the Proxy method except that you consult the SIP

Gateways section of the Phone System / Outside Lines page and use the Add New SIP Gateway to define a