Operation Manual

ST2030s VoIP Business Phone
ST2030s SIP Administrator Guide v3.0 Page 101 of 308
Switch implementation
Requirement
- [Switch] softkey is required to caller parties to switch between caller during conversation
Below is to list out a flow which shows IP Phone B call to IP phone A in conversation, then
PSTN 1 call to IP phone B. B and PSTN 1 are in conversation. Phone B presses [Switch] back to
phone A and start conversation.
Flow descriptions:
Phone A   Phone B, operate in normal SIP protocol
PSTN 1  phone B, call waiting tone is played, same as the call waiting flow above  call
activated
Phone B presses [Switch] to talk back with phone A
(PSTN 1 and Phone B are in conversation)
ST2030s (Phone B) ST2022s (Phone B)
When [Switch] is pressed, switching is processed.
01 PSTN Call/phone number
Talking Duration
Hold
Switch
Conf
Transf >
Date
Hour
Icons
01 PSTN Call/phone number
Taking Duration
Hold
Switch
Conf
Transf >
Phone B press [Switch] to start switching to other party
INFO: flashhook
PSTN1 is on hold and B stops the call waiting tone
INFO: Tone-type=specialdial, dial-timer=0
Phone send “2” to enable the take the call,
INFO: digit =2
Server Phone B
INFO
200 OK
INVITE (no SDP)
200 OK (with SDP)
INFO
ACK
200 OK
INFO
200 OK