1.21.1 Integrated Services Digital Network (ISDN)
1.21.1.8 Three-party Conference (3PTY)—by ISDN
Description
During a conversation using an ISDN line, an extension user can add another party and establish a three-party
conference call using the ISDN service of the telephone company, instead of the PBX feature.
Conditions
•
This feature complies with the following European Telecommunication Standard (ETS) specification:
–
ETS 300 188 Three-Party (3PTY) supplementary service.
•
The availability of this feature depends on the contract with the telephone company.
•
This feature can be enabled or disabled on an ISDN port basis.
User Manual References
1.4.5 Multiple Party Conversation
220
Feature Guide