Samsung SGH-T539ABBTMB - Manual (Page 34)

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When you have an active call and a call on hold, you may switch between the two
calls, changing the one on hold to active and placing the other on hold.
To switch between the two calls, simply press the Options soft key and select
Swap.
The current call is placed on hold and the call on hold is reactivated so that you can
continue conversing with that person.
When you want to finish, end each call normally by pressing the key.
Muting or Sending Key Tones
These options allow you to turn the key tones off or on. If the Keypad tone is set to
Off, your phone does not transmit the DTMF (Dual Tone Multi-Frequency) tones of
the keys, which allows you to press keys without hearing annoying key tones during
a call.
Note: To communicate with answering machines or computerized telephone systems, the Keypad tone
must be turned On.
Making a Multi-Party Call
A multi-party call is a network service that allows up to six people to take part
simultaneously in a multi-party or conference call.
Note: The number of callers is Network Dependent, so this number may vary.
For further details about subscribing to this service, contact your service provider.
Setting up a Multi-Party Call
1. Call the first participant in the normal way.
2. Press the Options soft key and select Hold call.
3. Make the second call in the normal way.
4. To join the first participant to the multi-party call, press the Options soft
key or the key and select Join. Press the Select soft key or the
key.
You can add incoming callers by answering the call and pressing the Options soft
key or the
key, and selecting Join. Repeat as required.
Note: A multiparty call can only consist of up to three callers (including yourself). Any additional callers
would be added to a separate multiparty call.