Q.931 Call States

Q.931 Call Stats，在 Q.931 提到的 calls 有 circuit-switched、packet-mode、temporary signalling、和 global call reference。

null state 不存在

c(U0): No call exists.

c(N0): No call exists.

p(U0): No access connection exists.

p(N0): No access connection exists.

t(U0): No call exists.

t(N0): No call exists.

g(Rest 0): No transaction exists.

call initiated 撥出，user 送出請求或 network 收到請求

c(U1): This state exists for an outgoing call, when the user requests call establishment from the network.

c(N1): This state exists for an outgoing call when the network has received a call establishment request but has not yet responded.

p(U1): This state exists for an outgoing access connection when the user requests access connection establishment from the network.

p(N1): This state exists for an outgoing access connection when the network has received an access connection establishment request but has not yet responded.

t(U1): This state exists for an outgoing call when the user requests call establishment from the network.

t(N1): This state exists for an outgoing call when the network has received a call establishment request but has not yet responded.

overlap sending 撥出，user 收到認可後送 overlap 訊息或 network 認可請求可接收 overlap 訊息

c(U2): This state exists for an outgoing call when the user has received acknowledgement of the call establishment request which permits the user to send additional call information to the network in overlap mode.

c(N2): This state exists for an outgoing call when the network has acknowledged the call establishment request and is prepared to receive additional call information (if any) in overlap mode.

t(U2): This state exists for an outgoing call when the user has received acknowledgement of the call establishment request which permits the user to send additional call information to the network in overlap mode.

t(N2): This state exists for an outgoing call when the network has acknowledged the call establishment request and is prepared to receive additional call information (if any) in overlap mode.

outgoing call proceeding

c(U3): This state exists for an outgoing call when the user has received acknowledgement that the network has received all call information necessary to effect call establishment.

c(N3): This state exists for an outgoing call when the network has sent acknowledgement that the network has received all call information necessary to effect call establishment.

p(U3): This state exists for an outgoing access connection when the user has received acknowledgement that the network has received all access connection information necessary to effect access connection establishment.

p(N3): This state exists for an outgoing access connection when the network has sent acknowledgement that the network has received all access connection information necessary to effect access connection establishment.

t(U3): This state exists for an outgoing call when the user has received acknowledgement that the network has received all call information necessary to effect call establishment.

t(N3): This state exists for an outgoing call when the network has sent acknowledgement that the network has received all call information necessary to effect call establishment.

call delivered

c(U4):This state exists for an outgoing call when the calling user has received an indication that remote user alerting has been initiated.

c(N4): This state exists for an outgoing call when the network has indicated hat remote user alerting has been initiated.

t(U4): This state exists for an outgoing call when the calling user has received an indication that remote user alerting has been initiated.

t(N4): This state exists for an outgoing call when the network has indicated that remote user alerting has been initiated.

call present

c(U6)"This state exists for an incoming call when the user has received a call establishment request but has not yet responded.

c(N6): This state exists for an incoming call when the network has sent a call stablishment request but has not yet received a satisfactory response.

p(U6): This state exists for an incoming access connection when the user has received an access connection establishment request but has not yet responded.

p(N6): This state exists for an incoming access connection when the network has sent an access connection establishment request but has not yet received a satisfactory response.

t(U6): This state exists for an incoming call when the user has received a call establishment request but has not yet responded.

t(N6): This state exists for an incoming call when the network has sent a call establishment request but has not yet received a satisfactory response.

call received

c(U7) This state exists for an incoming call when the user has indicated alerting but has not yet answered.

c(N7): This state exists for an incoming call when the network has received an indication that the user is alerting but has not yet received an answer.

p(U7): This state exists for an incoming access connection when the user has indicated alerting but has not yet answered.

p(N7): This state exists for an incoming access connection when the network has received an indication that the user is alerting but has not yet received an answer.

t(U7): This state exists for an incoming call when the user has indicated alerting but has not yet answered.

t(N7): This state exists for an incoming call when the network has received an indication that the user is alerting but has not yet received an answer.

connect request

c(U8) This state exists for an incoming call when the user has answered the call and is waiting to be awarded the call.

c(N8): This state exists for an incoming call when the network has received an answer but the network has not yet awarded the call.

p(U8): This state exists for an incoming access connection when the user has accepted the access connection and is waiting to be awarded the access connection.

p(N8): This state exists for an incoming access connection when the network has received an answer but the network has not yet awarded the access connection.

t(U8): This state exists for an incoming call when the user has answered the call and is awaiting to be awarded the call.

t(N8): This state exists for an incoming call when the network has received an answer but the network has not yet awarded the call.

incoming call proceeding

c(U9) This state exists for an incoming call when the user has sent acknowledgement that the user has received all call information necessary to effect call establishment.

c(N9): This state exists for an incoming call when the network has received acknowledgement that the user has received all call information necessary to effect call establishment.

p(U9): This state exists for an incoming access connection when the user has sent acknowledgement that the user has received all access connection information necessary to effect access connection establishment.

p(N9): This state exists for an incoming access connection when the network has received acknowledgment that the user has received all access connection information necessary to effect access connection establishment.

t(U9): This state exists for an incoming call when the user has sent acknowledgement that the user has received all call information necessary to effect call establishment.

t(N9): This state exists for an incoming call when the network has received acknowledgement that the user has received all call information necessary to effect call establishment.

active

c(U10) This state exists for an incoming call when the user has received an acknowledgement from the network that the user has been awarded the call. This state exists for an outgoing call when the user has received an indication that the remote user has answered the call.

c(N10): This state exists for an incoming call when the network has awarded the call to the called user. This state exists for an outgoing call when the network has indicated that the remote user has answered the call.

p(U10): This state exists for an incoming access connection when the user has received an acknowledgement from the network that the user has been awarded the access connection. This state exists for an outgoing access connection when the user has received an indication that the local network has completed the access connection.

p(N10): This state exists for an incoming access connection when the network has awarded the access connection to the called user. This state exists for an outgoing access connection when the local network has indicated that the access connection has been completed.

t(U10): This state exists for an incoming call when the user has received an acknowledgement from the network that the user has been awarded the call. This state exists for an outgoing call when the user has received an indication that the remote user has answered the call.

t(N10): This state exists for an incoming call when the network has awarded the call to the called user. This state exists for an outgoing call when the network has indicated that the remote user has answered the call.

disconnect request

c(U11) This state exists when the user has requested the network to clear the end-to-end connection (if any) and is waiting for a response.

c(N11): This state exists when the network has received a request from he user to clear the end-to-end connection (if any).

p(U11): This state exists when the user has requested the local network to clear the access connection and is waiting for a response.

p(N11): This state exists when the network has received a request from the user to clear the access connection.

disconnect indication

c(U12) This state exists when the user has received an invitation to disconnect because the network has disconnected the end-to-end connection (if any).

c(N12): This state exists when the network has disconnected the end-to-end connection (if any) and has sent an invitation to disconnect the user-network connection.

p(U12): This state exists when the user has received an invitation to disconnect because the network has disconnected the access connection to end connection (if any).

p(N12): This state exists when the network has sent an invitation to disconnect the user-network access connection.

suspend request

c(U15) This state exists when the user has requested the network to suspend the call and is waiting for a response.

c(N15): This state exists when the network has received a request to suspend the call but has not yet responded.

resume request

c(U17) This state exists when the user has requested the network to resume a previously suspended call and is waiting for a response.

c(N17): This state exists when the network has received a request to resume a previously suspended call but has not yet responded.

release request

c(U19) This state exists when the user has requested the network to release and is waiting for a response.

c(N19): This state exists when the network has requested the user to release and is waiting for a response.

p(U19): This state exists when the user has requested the network to release the access connection and is waiting for a response.

p(N19): This state exists when the network has requested the user to release the access connection and is waiting for a response.

t(U19): This state exists when the user has requested the network to release and is waiting for a response.

t(N19): This state exists when the network has requested the user to release and is waiting for a response.

call abort

c(N22): This state exists for an incoming call for the point-to-multipoint configuration when the call is being cleared before any user has been awarded the call.

p(N22): This state exists for an incoming access connection for the point-to-multipoint configuration when the access connection is being cleared before any user has been awarded the access connection.

t(N22): This state exists for an incoming call for the point-to-multipoint configuration when the call is being cleared before any user has been awarded the call.

overlap receiving

c(U25) This state exists for an incoming call when the user has acknowledged the call establishment request from the network and is prepared to receive additional call information (if any) in overlap mode.

c(N25): This state exists for an incoming call when the network has received acknowledgement of the call establishment request which permits the network to send additional call information (if any) in the overlap mode.

t(U25): This state exists for an incoming call when the user has acknowledged the call establishment request from the network and is prepared to receive additional call information (if any) in overlap mode.

t(N25): This state exists for an incoming call when the network has received acknowledgement of the call establishment request which permits the network to send additional call information (if any) in the overlap mode.

restart request

(Rest 1): This state exists for a restart transaction when the user has sent a restart request but has not yet received an acknowledgement response from the network.

(Rest 1): This state exists for a restart transaction when the network has sent a restart request but has not yet received an acknowledgement response from the user.

restart

(Rest 2): This state exists when a request for a restart has been received from the network and responses have not yet been received from all locally active call references.

(Rest 2): This state exists when a request for a restart has been received from the user and a response has not yet been received from all locally active call references.

circuit		packet		temp		global
U0	N0	U0	N0	U0	N0	Rest0
U1	N1	U1	N1	U1	N1	-
U2	N2	-	-	U2	N2	-
U3	N3	U3	N3	U3	N3	-
U4	N4	-	-	U4	N4	-
U6	N6	U6	N6	U6	N6	-
U7	N7	U7	N7	U7	N7	-
U8	N8	U8	N8	U8	N8	-
U9	N9	U9	N9	U9	N9	-
U10	N10	U10	N10	U10	N10	-
U11	N11	U11	N11	-	-	-
U12	N12	U12	N12	-	-	-
U15	N15	-	-	-	-	-
U17	N17	-	-	-	-	-
U19	N19	U19	N19	U19	N19	-
-	N22	-	N22	-	N22	-
U25	N25	-	-	U25	N25	-
-	-	-	-	-	-	Rest1 (61)
-	-	-	-	-	-	Rest2 (62)

Q.931 STATUS IE Call state 3.1.16, 3.2.10, 3.3.11. 3.4.3. 4.5.7

Call state value (octet 3) Bits 6 5 4 3 2 1 User State Network state 0 0 0 0 0 0 U0 – Null N0 – Null 0 0 0 0 0 1 U1 – Call initiated N1 – Call initiated 0 0 0 0 1 0 U2 – Overlap sending N2 – Overlap sending 0 0 0 0 1 1 U3 – Outgoing call proceeding N3 – Outgoing call proceeding 0 0 0 1 0 0 U4 – Call delivered N4 – Call delivered 0 0 0 1 1 0 U6 – Call present N6 – Call present 0 0 0 1 1 1 U7 – Call received N7 – Call received 0 0 1 0 0 0 U8 – Connect request N8 – Connect request 0 0 1 0 0 1 U9 – Incoming call proceeding N9 – Incoming call proceeding 0 0 1 0 1 0 U10 – Active N10 – Active 0 0 1 0 1 1 U11 – Disconnect request N11 – Disconnect request 0 0 1 1 0 0 U12 – Disconnect indication N12 – Disconnect indication 0 0 1 1 1 1 U15 – Suspend request N15 – Suspend request 0 1 0 0 0 1 U17 – Resume request N17 – Resume request 0 1 0 0 1 1 U19 – Release request N19 – Release request 0 1 0 1 1 0 – - - - - - N22 – Call abort 0 1 1 0 0 1 U25 – Overlap receiving N25 – Overlap receiving Global interface state value (octet 3) Bits 6 5 4 3 2 1 State 0 0 0 0 0 0 REST0 – Null 1 1 1 1 0 1 REST1 – Restart request 1 1 1 1 1 0 REST2 – Restart All other values are reserved