Aastra Telecom 800 User Manual

Voice over IP (VoIP)

VoIP System Telephones

71

The following telephones and software packages are available for VoIP system 
telephony:

■

Aastra 6773ip (OpenPhone 73 IP): This system telephone can be extended with 
up to three key extensions Aastra M671.

■

Aastra 6775ip (OpenPhone 75 IP): This system telephone can be extended with 
up to three key extensions Aastra M671 or Aastra M676).

■

Aastra 277xip (OpenPhone 7x IPC): This VoIP software offers the functionality 
of an IP system telephone using Windows 2000/XP executable software (see 
Aastra 277xip (OpenPhone 7x IPC) starting on page 79). This software also pro-
vides local answering machine functionality and can be integrated into CTI 
applications.

■

The older VoIP system telephones OpenPhone 63 IP and OpenPhone 65 IP can 
still be used. 

The VoIP system telephones offer the following specific device properties:

■

Two RJ45 connector ports are available for ethernet connection. The ports are 
connected to one another via the telephone’s internal switch. The switch sup-
ports 10 Mbit/s or 100 Mbit/s full-duplex with priority given to VoIP data trans-
mission.

Blind Transfer

SIP only: forwarding an incoming call without 
accepting the call; feature must be supported by SIP 
telephone or by the SIP software.

Keypad as “INFO” 
message

DTMF tones cannot be securely transferred “in band” 
via compression codecs. Digital “out band” transferral 
as “INFO” SIP message is supported. This feature must 
be available and activated on a SIP telephone or in 
the SIP software.