User`s manual

7.3 Telephone Calls

To make a call, simply dial the number. The dial plan (i.e. the dialed digits) is

normally customized for each installation. The default dial plan delivered by

Comtrend allows dialing of 4-digit extensions or direct IP addresses. Shorter

extension numbers (e.g. 3-digits) can be dialed by completing the dial string with

a final #.

When a Call Server (SIP Proxy Server) is configured into the system, the dialed

digits are translated and routed by the Call Server to the correct destination as

registered with the Call Server.

If no Call Server is configured, calls can still be made using 4-digit extensions,

rather than using full IP addresses. The originator translates the dialed-digits to a

destination device as follows:

First Digit: Line identifier (for multi-line gateways)

Remaining digits: Host number part of an IP address. The Network number part is

considered to be the same as the caller’s IP address.

For example, if a caller at address 10.136.64.33/24 dials “2023”, the call will be

placed to the second line at address 10.136.64.23. All devices have to be on the

same Class C subnet (24 bit subnet mask).

To dial an IP address directly, dial the IP address digits, using keypad * as the dot.

Complete the address with a final * or #. When using IP address dialing it is not

possible to specify which line at a gateway is called, so the gateway always routes

IP-address dialed calls to the first line.

Network busy tone (fast busy) will be played for unknown or unreachable

destinations. To answer a call, pick up the phone or press the handsfree button.

Caller ID

The Call Manager delivers Calling Number when placing calls. The calling number

is transmitted to the analog line for CLASS recognition.

Call Hold

To put a call on hold, press flash then hang up (optional). To return to the original

call, press flash or pick up the phone. The phone will issue a short ring burst

every 30 seconds or so while on-hook to remind you that a call is on hold.

Call Transfer

• To transfer a call, press flash then dial the new number.

• To transfer immediately, hang up (blind transfer).

• To transfer with consultation, wait for the party to answer, consult, and

hang up.

• To abort the transfer (if the third party does not answer), press flash to

return to the original call.