Appendix D — Working with Firewalls

Appendix D — Working with Firewalls

The 5055 SIP phone can be configured to work behind Network Address Translation (NAT) firewalls which are not SIP aware by enabling the SIP configuration Bypass Firewall NAT feature and configuring the firewall correctly. To do this:

1.Locate the documentation that came with your NAT firewall and look for instructions on how to configure a Demilitarized Zone (DMZ) server. You must configure the 5055 SIP phone to function as a DMZ server to the firewall.

2.Use the 5055 SIP phone configuration web page to:

A.Login to the phone using the web interface and select Network Configuration Configure a static IP address, Subnet Mask, Gateway, and DNS server address. Turn DHCP off.

B.Select SIP Configuration. Set Bypass Firewall NAT On.

C.In the "Mode" box select static if the IP of the WAN port of the router never changes. Select dynamic if the IP changes as the result of DHCP or PPPOE.

D.If you selected static IP in step C., enter this IP in the WAN IP Address field. If you selected dynamic, enter the URL of the service provider in the "WAN IP Discovery URL" field.

E.Click the Apply button and verify if Bypass Firewall NAT is still set to On. If dynamic IP address is used, also verify that WAN IP Address field has been filled in with a valid address. If Bypass Firewall NAT resets to off, or there is no IP address in the WAN IP Address field, then there is likely a problem with the WAN IP Discovery URL that is preventing the phone from obtaining the router’s WAN IP address.

Tip: The 5055 SIP phone must be in a factory-default state (this configuration will not work with the phone registered or trying to register). To do this power-cycle the phone while holding down the 3 key and answer “yes” when asked if you want to “use factory default.”

Tip: There are some service providers that provide free Dynamic IP services. If your Service provider does not provide this service, you can try either of these: www.sdforlaget.se/remoteip.asp or

http://www.changeip.com/ip.asp

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Mitel 5055 manual Appendix D Working with Firewalls, Select SIP Configuration. Set Bypass Firewall NAT On
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5055 specifications

The Mitel 5055 is a robust and versatile communication device tailored for the needs of modern businesses. Featuring a sleek design and user-friendly interface, the Mitel 5055 is built to enhance productivity and streamline communication within an organization.

One of the standout features of the Mitel 5055 is its advanced VoIP (Voice over Internet Protocol) technology, which allows users to make phone calls over the internet, reducing costs and improving call quality. This technology is essential for companies looking to optimize their communication infrastructure. Additionally, the device supports various codecs, ensuring compatibility with different networks and environments, thus providing flexibility for users.

The Mitel 5055 is equipped with a large backlit display, enhancing visibility and usability in various lighting conditions. This feature is particularly beneficial for busy professionals who rely on quick access to information. Furthermore, it has programmable keys and a designed layout that allows customization according to user preferences. This level of personalization enables users to streamline their daily tasks efficiently.

Another key characteristic of the Mitel 5055 is its integrated conference calling feature, making it ideal for team collaboration. With this capability, multiple users can join a single call, promoting effective communication regardless of their physical locations. It also supports call transfer, voicemail, and call waiting features, ensuring that users never miss an important call.

The device is compatible with a range of Mitel communication platforms, offering seamless integration into existing systems. Whether your organization is using Mitel's cloud services or on-premises solutions, the 5055 is designed to fit in. The support for SIP (Session Initiation Protocol) further enhances its interoperability with various telephony systems, making it a practical choice for diverse business environments.

Security is another crucial aspect of the Mitel 5055, as it features encrypted communication to protect sensitive information during calls. This focus on security is essential for businesses handling confidential data and ensures compliance with various regulatory standards.

In summary, the Mitel 5055 delivers a comprehensive set of features, utilizing cutting-edge technologies to meet the evolving needs of communications in the modern workplace. Its combination of user-friendly design, advanced VoIP technology, and strong security protocols make it an excellent choice for businesses looking to improve their communication systems.
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