Call forwarding (i.e. automatic call transfer) from various SIP devices functions with restrictions only, or not at all

For some SIP phones, pressing the hash key ("#") while dialing with an off-hook handset or with an activated speakerphone function triggers immediate dialing. This means that controlling PBXs with the hash key is either not possible, or it can be used for the first character only.

The LANCOM Advanced VoIP Client does not signal an asterisk (*) in the SIP-URI when establishing a call if the sequence ends in a hash.

Solution:

Generally speaking, telephone numbers that include control codes (keypad facilities) can be entered into SIP telephones even when the handset is on-hook or when the speakerphone is not active. Picking up the handset or activating the speakerphone then initiates dialing. This method is suitable for controlling PBX functions.

The VoIP Call Manager now also supports control by this method if the keypad-facility control code does not end with the hash "#" sign. In this way, keypad facilities can be used with the LANCOM Advanced VoIP Client as well.

Examples

Set up immediate call forwarding to the telephone number 504:

*21*504# can alternatively be actvated with *21*504

Temporarily disable immediate call forwarding:

#22# can alternatively be set with #22