Mitel 5560 IPT none Specifications Page 160

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Engineering Guidelines
146
IP Networking and Product Release Compatibility
Product improvement is part of an important and ongoing process and it includes the need for
new product releases. While every effort is made during the development process to ensure
that the new release is compatible with earlier releases, there may be instances where this
cannot be fully achieved. This may become apparent due to, but not limited to, differences in
expected system operation and feature availability. To minimize such instances, ensure that
networked units operate with the same software release numbers or at least minimal differences
between release levels. Please contact Mitel Technical Support to determine if such issues are
likely when planning your upgrade.
SIP Trunking
Service providers and carriers offer their customers the option of connecting to the service
provider via a SIP (Session Initiated Protocol) trunk. SIP Trunking can be a more cost effective
method of obtaining PSTN connectivity.
SIP Trunking Basics
The 3300 can use SIP trunks to connect to service providers that offer SIP gateway or trunk
connectivity. The SIP trunking solution provides basic telephony functionality, billing capability,
emergency services support, FAX support, and more.
The SIP trunking solution also provides T.38 Fax over IP capabilities, for additional information
see “Support for FAX over IP” on page 147.
Licenses
You can purchase SIP trunking as an option. The 3300 ICP supports a maximum of 2000 SIP
licenses. SIP licenses are obtained through the AMC server.
Networking ICPs with IP trunks
When using IP trunks to network multiple ICPs together, all ICPs in the network should be
upgraded to a recent version of software if SIP is licensed. This will ensure RTP stream
compatibility for DTMF digits, NAT traversal, etc.
The SX-200
®
ICP is not compatible with a 3300 ICP that is using SIP to connect to a service
provider.
Networking ICPs with TDM trunks
Networks that connect ICPs together using TDM trunks will continue to function as they did in
previous releases. SIP does not affect this behavior. In fact, the 3300 ICP can operate as a
Gateway between a TDM connected PBX and a SIP Service Provider.
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