You have to configure the "conference together" button since the code for conferencing calls will vary, as will other things like recall time, etc.
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Set the Flash Hook Time
The B149 and B159 analog phones need to use a flash hook time in the same range as that being used by the IP Office. That default values the IP Office uses depend on its system locale, refer to the "IP Office Locale Settings Reference" manual. However, individual extensions can be configured separately (see Extension | Analogue | Flash Hook Pulse Width). The setting can be tested by making a call to another extension during which pressing b100_off_hook_button should toggle the call on hold and back if the flash hook time is set correctly.
To set the flash hook time:
1. Press the b100_menu_button Menu button.
2. Scroll to SETTINGS and press OK.
3. Scroll to FLASH and press OK.
4. Select a value that falls in the range set in the IP Office configuration for the extension and press OK.
5. To exit the menus, press b100_menu_button Menu again. To exit the current menu option, press b100_back_button.
Set the Conference Codes
The phones need to be configured with a number of conference codes. The main conference code required is one to conference the phones current and held calls. This needs to be set to match a conference add short code on the IP Office system (the default system short code is *47).
1.Press the b100_menu_button Menu button.
2.Scroll to CONF GUIDE and press OK.
3.Scroll to SETTINGS and press OK.
4.At the ENQUIRY prompt enter F and OK. Enter F by pressing the b100_off_hook_button key. Backspace by pressing b100_back_button.
5.At the CONFERENCE prompt enter F and the IP Office conference add short code, for example F*47. Press OK.
6.At the RETURN prompt enter F and press OK.
7.To exit the menus, press b100_menu_button Menu again. To exit the current menu option, press b100_back_button.
Stuck in a never ending cycle of file copying.