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IP Office 5

Avaya IP Office 5 introduces some exciting changes to SIP Trunking on the IP Office Platform. In IP Office version 5:

• Many 3rd party SIP endpoints tested: a complete list will be released in August 2009
• Also supported sn the SIP ATA which allows an analog G3 device to be connected to SIP/IP network
• Call features supported:
  • Basic call to other SIP Phone or Legacy Phone
  • Call Waiting
  • Do Not Disturb
  • Message Waiting Support
  • Call Hold & Consultation Hold
  • Attended & Unattended Transfer
  • Call Forward Unconditional, Busy and No Answer (using short codes)
  • 3 way conference - 3rd Party added / Joins
  • Other IP Office features enabled by short codes
  • Reliable fax transit over IP network using T.38 Fax protocol

IP Office 4.2

SIP trunks allow IP Office users to take advantage of new telephony services being offered by 'Internet Telephony Service Providers (ITSPs)'. In many cases, these telephony services can offer substantial savings in comparison to traditional exchange lines. The IP Office solution allows all users, regardless of their phone type, to make and receive SIP calls. SIP trunks are handled like any other line on IP Office, affording all the call routing and toll control needed to manage inbound and outbound calls. SIP trunks on IP Office require the provisioning of voice compression channels through the installation of VCM modules within the control unit. RTP Relay is also supported to allow the IP stream through SIP after call setup. A license for the maximum required number of simultaneous SIP calls is also needed. There are several possible network topologies for SIP trunk systems, as shown in the following diagrams.

Option 1: Service provider with a Session Border Controller (SBC), which solves NAT traversal issues. This is the most reliable and preferred method.

Option 2: Direct connection from the IP Office's second Ethernet port to the internet via a DMZ (demilitarized zone) port on the router. To make this configuration secure, the IP Office firewall is set to drop all packets except SIP.

Option 3: Connection to the ITSP over NAT using 3rd party STUN (Simple Traversal of UDP through NAT) servers in the network to discover the NAT mechanism being used.

Option 4: Connection to the ITSP through a router equipped with an Application Level Gateway (ALG) which transparently resolves all NAT issues.

Avaya IP Office Phone System Features List

New! Have you seen our new Avaya IP Office Phone System site at http://officephonesystem.co.uk? Every IP Office Phone System feature has been updated there, and it also includes all the latest information about Avaya IP Office Release 9, out September 2013.