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1.20 Integrated Services Digital Network (ISDN) Service Features
Feature Guide 195
1.20.1.8 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.
This feature complies with the following European Telecommunication Standard (ETS)
specifications: ETS 300 188 Three-Party (3PTY) supplementary service.
Conditions
• The availability of this feature is depending on the contract with the telephone company.
• This feature can be enabled or disabled on an ISDN port basis.
User Manual References
User Manual
1.4.5 Multiple Party Conversation