Chapter 17-IVR Services
Polycom, Inc. 17-33

Inviting Participants using DTMF

A participant in a video or audio conference can invite another participant to the conference
using the touch-tone DTMF numeric keypad on the participant’s endpoint. You can invite a
participant using various communication devices, such as a mobile phone, an IP phone,
PSTN phones, laptops, or connect to another conference running on another PBX or MCU.

Invite Call Flow

The following flow describes how a participant is invited to the conference using the DTMF
codes:
1During the conference, the participant enters the DTMF code (default is *72) on the
numeric keypad to invite another participant.
2The participant is prompted to enter the invited participant’s destination number (a
number or IP address) including the prefix (if required) and the DTMF delimiter digit
(‘*’ or ‘#’) at the end. The asterisk (‘*’) is used to denote the dot in the IP address.
For example: To enter an IP address such as 10.245.22.19, on the DTMF keypad press
10*245*22*19 and then the DTMF delimiter.
3The system automatically dials to the destination according to the protocol order as
defined in the IVR Services Properties - Video Services tab.
When the call cannot be completed by the current protocol, the system attempts to
connect to the destination using the next protocol according to the protocol order.
The RMX connects the participant when the call is answered.
4The last invited participant can be disconnected when the inviting participant enters the
DTMF code (default is #72) on the numeric keypad.

Entering Additional DTMF Codes

In some environments, the call is answered by an IVR system (for example when connecting
to another conference or PBX), requesting a password or a destination number to complete
the connection process. In such a case, additional DTMF digits must be entered before the
DTMF forward duration time has expired and are forwarded to the invited destination.
When the additional DTMF codes are entered, they are heard by all the conference
participants.
If the DTMF code is not entered on time or if the wrong DTMF code is entered, the
participant is prompted for a new input. After the defined number of retries have elapsed,
the call is ended.

Error Handling

• If the destination endpoint is busy or the participant did not answer, the system ends
the call.
• When an incorrect number is entered, the call fails and an error message is displayed.
• If the destination number is not entered in a specific amount of time (defined in
Timeout for user input in the IVR Services - Global tab), the participant is prompted to
enter a destination number again. Depending on the Number of user input retries as
Digits that are entered after the DTMF delimiter and before the participant is connected are ignored.