If the network does not receive any response to the retransmitted SETUP message prior to the expiration of timer T303, then the network shall initiate clearing procedures towards the calling user with cause No. 18, no user responding.
a) If the SETUP message was delivered by a broadcast data link, the network shall enter the Call Abort state.
b) If the SETUP message was delivered on a point-to-point data link, the network shall also initiate clearing procedures towards the called user in accordance with 5.3.4,using cause No. 102, recovery on timer expiry.
If the network receives a user's first response to SETUP when in the Call Abort state but before timer T312 has expired, the network shall initiate clearing to the called user as described in 5.3.2 b), except that the cause No. 102, recovery on timer expiry shall be sent. If the network receives a message that is a user's first response to an incoming call after timer T312 has expired, the network will interpret this message as a message received with an invalid call reference value, as described in 5.8.3.2.
If the network has received a CALL PROCEEDING message, but does not receive an ALERTING, CONNECT, or DISCONNECT message prior to the expiration of timer T310, then the network shall initiate clearing procedures towards the calling user with cause No. 18, no user responding and initiate clearing procedures towards the called user.
1) If the SETUP message is delivered by a broadcast data link, the called user shall be cleared in accordance with 5.3.2 e), except that cause No. 102, recovery on timer expiry shall be sent.
2) If the SETUP message was delivered on a point-to-point data link, the called user shall be cleared in accordance with 5.3.4 using cause No. 102, recovery on timer expiry.
If the network has received an ALERTING message, but does not receive a CONNECT or DISCONNECT message prior to the expiry of timer T301 (or a corresponding internal alerting supervision timing function), then the network shall initiate clearing procedures towards the calling user with cause No. 19, user alerting, no answer; and initiate clearing procedures towards the called user.
i) If the SETUP message was delivered by a broadcast data link, the called user shall be cleared in accordance with 5.3.2 e), except that cause No. 102, recovery on timer expiry shall be sent.
ii) If the SETUP message was delivered on a point-to-point data link, the called user shall be cleared in accordance with 5.3.4, using cause No. 102, recovery on timer expiry.