IP Office SIP

IP Office 4 introduced Session Initiated Protocol (SIP) trunks. 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 over traditional lines.

The IP Office solution allows all users, regardless of their phone type, to make and receive SIP calls. Even basic analog phones can make or 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. Should a SIP trunk fail or become busy, calls are re-routed to the PSTN automatically. To minimize Voice Compression usage, RTP relay is also supported to allow IP phones to converse directly once the call is set up. The number of simultaneous SIP calls allowed on the system at one time can be arranged by a license.

IP Office 5 & SIP

IP Office 5 adds further support for SIP telephony. 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

This opens the way to purchase non-Avaya SIP handsets and use them with IP Office. It doesn't give you as much functionality as Avaya handsets do, but does offer substantial savings.

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