Duvel,
in BC12 IP trunking is done via ELU32. concerning network services this is from alex :
It is possible to execute network services both in pure H.323 private networks and in mixed H.323/ISDN private networks (scenarios with H.323/ISDN gateway nodes).
The procedure to request services is based both on ASB 501 04 Specific Protocol in UUI message and Information field, and on GFP (ISO QSIG). The aim of this twofold way of requesting some services is to assure interworking with existing ISDN tie lines: UUI assures interworking with previous ASB 501 04 releases, whilst GFP assures interworking with PABXes in the mixed H.323/ISDN scenarios mentioned above.
The service information is included in H.225.0 messages by embedding Q.931 messages.
The same signalling procedures as in ISDN trunks are kept in H.323 trunks. Q.931 messages are embedded inside H.225.0 messages of the same message type, when possible.
The way some of the services (e.g., call diversion) are executed (in a proprietary way based either on UUI or on ISO QSIG) can be set in the destination configuration or, in some cases, can be chosen by means of the Application System Parameter PARNUM=223.
The following services make use of embedded UUI signalling:
Account code
Authorization code
Call Back
Call Deflection
Call Diversion
Call Extending
Call Offer
Called Party Number
Calling/Connected Line Identity
Calling/Connected Line Identity Restriction
Calling/Connected Name Identity
Customer Identity
Day/Night Service Notification
DNIS for ACD
FRL/TCM
Intrusion
Message Waiting Notification
Night Service Diversion
Priority Routing
Repeated Deflection
Rerouting
Transfer
Type of Party
Voice Mail facility
And these services are executed based on ISO QSIG standards:
Advice of Charge
Call Completion
Call Forwarding
Call Offer
Call Transfer
Calling/Connected Line Identity Restriction (only public number)
Calling/Connected Name Identity (without presentation rules)
Path replacement
Type of Party (through ISO common information)
2.10 Protocol
The IP networking facility is based on the ITU-T H.323 version 2 recommendation (H.225.0 and H.245 protocols).
Regarding the H.225.0 RAS protocol, only the location messages are supported.
No registration is supported. So, transport addresses for signalling must be set up by means of
I/O commands.
2.11 CODECs
2.11.1 Voice CODECs support
The H.323 network interfaces (ELU32 boards) are capable of using different types of audio codecs in GW calls (in non-GW calls the media is not routed through the ASB 501 04, but directly through the IP network).
The voice CODEC to be used in calls is negotiated and selected per call (H.245 phase).
In the table below there is a list of the voice CODECs supported by the ELU32 boards.
The bit rate stated for each CODEC (i.e., the bandwidth required for the packets) is a net value. That is, this value does not include the overhead caused by packet headers. So, the real bit rate of a voice stream encoded by these CODECs is higher than the bit rate indicated in the table.
CODEC BW (kbit/s) Frame length Frames/packet
G.729 Annex A 8 10 ms 3
G.729 Annex A with annex B 8 10 ms 3
G.723.1 5.6-6.3 30 ms 1
G.711 A-law 64 kbit/s 64 1 ms 30, 32
G.711 µ-law 64 kbit/s 64 1 ms 30, 32
2.11.2 Choice of CODECs
It is possible via I/O command to state preferences (and the relative priorities among them) concerning the order in which the voice CODECs must be selected in GW calls. This list of ordered preferences is useful to fit the particular voice quality requirements and the bandwidth availability in each customer installation.
In calls between two ASB 501 04 systems, only the priorities defined at the originating side are considered. In calls between ASB 501 04 and other systems, the priorities are considered depending on the H.245 master-slave negotiation.
2.11.3 CODECs restriction in transit calls
The IP networking facility allows to restrict the CODEC to be used in transit calls, where subsequent transcodings can spoil the speech signal quality. The use of the G.711 CODEC in this kind of calls can be forced on a per-system basis via I/O command.
It is possible to execute network services both in pure H.323 private networks and in mixed H.323/ISDN private networks (scenarios with H.323/ISDN gateway nodes).
The procedure to request services is based both on ASB 501 04 Specific Protocol in UUI message and Information field, and on GFP (ISO QSIG). The aim of this twofold way of requesting some services is to assure interworking with existing ISDN tie lines: UUI assures interworking with previous ASB 501 04 releases, whilst GFP assures interworking with PABXes in the mixed H.323/ISDN scenarios mentioned above.
The service information is included in H.225.0 messages by embedding Q.931 messages.
The same signalling procedures as in ISDN trunks are kept in H.323 trunks. Q.931 messages are embedded inside H.225.0 messages of the same message type, when possible.
The way some of the services (e.g., call diversion) are executed (in a proprietary way based either on UUI or on ISO QSIG) can be set in the destination configuration or, in some cases, can be chosen by means of the Application System Parameter PARNUM=223.
The following services make use of embedded UUI signalling:
Account code
Authorization code
Call Back
Call Deflection
Call Diversion
Call Extending
Call Offer
Called Party Number
Calling/Connected Line Identity
Calling/Connected Line Identity Restriction
Calling/Connected Name Identity
Customer Identity
Day/Night Service Notification
DNIS for ACD
FRL/TCM
Intrusion
Message Waiting Notification
Night Service Diversion
Priority Routing
Repeated Deflection
Rerouting
Transfer
Type of Party
Voice Mail facility
And these services are executed based on ISO QSIG standards:
Advice of Charge
Call Completion
Call Forwarding
Call Offer
Call Transfer
Calling/Connected Line Identity Restriction (only public number)
Calling/Connected Name Identity (without presentation rules)
Path replacement
Type of Party (through ISO common information)
2.10 Protocol
The IP networking facility is based on the ITU-T H.323 version 2 recommendation (H.225.0 and H.245 protocols).
Regarding the H.225.0 RAS protocol, only the location messages are supported.
No registration is supported. So, transport addresses for signalling must be set up by means of
I/O commands.
2.11 CODECs
2.11.1 Voice CODECs support
The H.323 network interfaces (ELU32 boards) are capable of using different types of audio codecs in GW calls (in non-GW calls the media is not routed through the ASB 501 04, but directly through the IP network).
The voice CODEC to be used in calls is negotiated and selected per call (H.245 phase).
In the table below there is a list of the voice CODECs supported by the ELU32 boards.
The bit rate stated for each CODEC (i.e., the bandwidth required for the packets) is a net value. That is, this value does not include the overhead caused by packet headers. So, the real bit rate of a voice stream encoded by these CODECs is higher than the bit rate indicated in the table.
CODEC BW (kbit/s) Frame length Frames/packet
G.729 Annex A 8 10 ms 3
G.729 Annex A with annex B 8 10 ms 3
G.723.1 5.6-6.3 30 ms 1
G.711 A-law 64 kbit/s 64 1 ms 30, 32
G.711 µ-law 64 kbit/s 64 1 ms 30, 32
2.11.2 Choice of CODECs
It is possible via I/O command to state preferences (and the relative priorities among them) concerning the order in which the voice CODECs must be selected in GW calls. This list of ordered preferences is useful to fit the particular voice quality requirements and the bandwidth availability in each customer installation.
In calls between two ASB 501 04 systems, only the priorities defined at the originating side are considered. In calls between ASB 501 04 and other systems, the priorities are considered depending on the H.245 master-slave negotiation.
2.11.3 CODECs restriction in transit calls
The IP networking facility allows to restrict the CODEC to be used in transit calls, where subsequent transcodings can spoil the speech signal quality. The use of the G.711 CODEC in this kind of calls can be forced on a per-system basis via I/O command.