Connectivity Options

Connectivity Options for Any Company


Zultys’ feature-rich open SIP standards IP PBXs allow the use of SIP, PSTN or T1/E1/PRI trunks and deliver a comprehensive feature set that adapts as business demands change, allowing companies to deploy what they need today, with an easy expansion path to handle tomorrow’s needs as well.


SIP and SIP-Trunking

SIP (Session Initiation Protocol) is the underlying power of the Zultys MX IP PBX platform. SIP is an Internet Engineering Task Force (IETF) standard protocol for initiating an interactive user session that involves multimedia elements such as video, voice, and chat.

Zultys’ MX250 and MX30 are built on an open standards IP PBX platform based upon the SIP standard. Zultys systems provide a powerful platform to deploy, manage and use SIP based IP phones and other third party SIP devices. By supporting IP open standards, Zultys ensures that not only do Zultys IP Phones operate with the MX system, but a host of other devices, such as third party SIP-based IP phones, conference room accessories, paging equipment, application servers, video phones and video conference servers are also supported.



Zultys products support the full complement of telephony interfaces. The MX250 supports analog circuits (FXS and FXO) and digital circuits (T1, E1, PRI and BRI) simultaneously. The MX250 provides three slots to accommodate telephony interfaces. Interface modules are used to connect to analog trunks (FXO), ISDN BRI, T1 and E1 digital circuits (CAS, ISDN, and MFC R2).

Additionally, analog phones and devices such as single line telephones or fax machines may be connected to the MX system via the FXS module. Two analog FXS circuits are provided as standard connections to the system. In many installations, this saves the client the initial investment in an FXS module when no more than two analog devices are needed. The built-in FXS ports of the MX250 may be configured to provide failover protection in the case of loss of commercial power by automatically switching the first two analog PSTN phone lines to these analog FXS ports.


Application Integration

Zultys supports TAPI (Telephony Application Program Interface), a standard programming interface that is part of Microsoft’s WOSA (Windows Open Services Architecture) development. It allows Windows client applications to access voice services on a server. TAPI is designed to provide interoperability between PCs and telephone equipment, including key systems and PBXs.

By utilizing TAPI as the open standards interface, Zultys’ MXIE unified communications desktop application is able to mend seamlessly with a variety of business applications.

Zultys ZIP-5 series IP phones also support XML (Extensible Markup Language) applications that allow companies to deliver custom applications and information services directly to their employees’ phones. Zultys provides users with access to a free XML support server.


Additional Teleworker, Fax and Data Networking Support


Teleworker Support

The Zultys MXconnect™ feature lets you easily deploy remote ‘Teleworker’ phones without needing a Virtual Private Network (VPN) connection. ANY phone number (e.g. your home office phone) can be an extension of your office. Automatic NAT traversal allows any phone with a DID to be fully connected to the corporate network — 3rd party analog/TDM devices, IP and SIP devices, mobile phones and satellite phones. Zultys IP PBXs also provide secure connectivity without needing an external VPN server.


Fax Support

The MX250 and MX30 include fax server functionality over any telephony interface. Incoming faxes can be answered by the MX and converted to a graphical file which can be sent via email to a user or retrieved using Zultys’ unified communications interface, MXIE (MX Interface for End-users). To send an outgoing fax, users print to the MXIE fax printer from any available application. MXIE delivers the fax file to the MX and updates the sender on the outcome of the transmission.


Data Networking

There are two 10/100Base-T ports available on the MX main board, accessible on the rear panel of the system. One of these is connected to the client’s LAN to provide connectivity to devices such as PCs and IP phones. Both circuits may be connected to separate Ethernet ports of two different data switches to provide redundancy protection against customer-owned data equipment failure. In this configuration, the switch-over relies on the spanning tree protocol of the MX250 to perform the handover, and is automatic and requires no human intervention.

The MX250 and MX30 can function as an edge router and connect directly to an ISP (Internet Service Provider). Default and static routes can be provisioned to control the proper routing of voice and data traffic.

The system incorporates a firewall with NAT, for connection to the Internet. Also DHCP, TFTP, and NTP servers provide services within the enterprise. Any of these functions may optionally be disabled if they are provided external to the MX.

The MX250 and MX30 provide SIP application layer gateway (ALG) functionality when the internal NAT and firewall functions are used. This allows users to make SIP calls outside of the private address space used within the enterprise.

The MX250 provides VPN functionality for up to 50 users. This allows remote users to securely access all functions of the MX250 and the corporate network. This function resolves many issues that traveling personnel are likely to encounter when attempting to connect via airport and hotel wired and wireless networks.