Aastra Telecom 41-001343-02 manual Shared Call Appearance SCA Call Bridging

Operational Features

Shared Call Appearance (SCA) Call Bridging

Shared Call Appearance (SCA) is when incoming calls are presented to multiple phones simultaneously. For example, it is the ability to assign the boss' extension to a button on the secretary's phone. Calls can be transferred between two phones with the same extension button by simply putting the call on hold at one phone and picking it up on the other. Status LEDs light and flash in unison, allowing all people sharing the extension to see the status at a glance.

The IP Phones include an enhanced SCA for the servers that support call bridging and allows two or more SCA users to be connected in a call with a third party.

Refer to the following example.

	Phone 1
			SCA phone 1 answers.
Phone A calls the SCA number and			When 2 and 3 pickup,
			1 can hangup.
all the phones in the SCA environment			SCA phone 2 joins by
ring.
Phone A	Phone 2		pressing SCA line. When
			phone 1 hangs up, 2 is still
		SCA Environment
			connected. Phone 2 can
			press the line key to
			put SCA call on hold
			leaving 3 still connected
	Phone 3		to 1.

Note: A user can place a call on hold while in an SCA bridged call, by pressing the SCA line key.

SCA phone 3 joins by pressing SCA line. When phone 1 hangs up, 3 is still connected. Phone 3 can press the line key to

put SCA call on hold leaving 2 still connected to 1.

Using the example above, when a call comes into Phone 1, Phone 2 and Phone 3 can pickup the same call by pressing the SCA line key. Phone 2 and 3 display the call they are bridging into on the LCD of the phones. Existing SCA parties in a bridge or one-to-one call hear an audible beep when another party has joined the call.

Note:

Enabling/disabling the beep is configurable on the server-side.

If a phone is configured for SCA bridging and it attempts to join a call, but the account on the server does not have this functionality enabled, an error message displays to the LCD on the phone.

The SCA call bridging feature is disabled by default on all phones. You can enable this feature on a global or per-line basis using the configuration files only.

Note:

A “Call-Info” header is included in the requests as well as the 200ok response to an INVITE, RE-INVITE, and UPDATE mes- sages for SCA lines.

Keys States and LED Behavior

There are two new call states on the phones that support SCA bridging:

•Bridge-active- A bridged call is in progress

•Bridge-held- The 3rd-party (i.e., non-SCA party) in the bridge is on hold.

The following tables provide the key states and LED behavior in an SCA bridge call for users involved in an SCA call and users not involved in the SCA call.

5-176 41-001343-02 REV04 – 05.2014