711 ??-law audio RTP/AVP 0 AS:64 rtpmap:0 PCMU/8000
Speech Speech G.711 ??-law audio RTP/AVP 0 AS:64 rtpmap: PCMU/8000
3.1 KHz
audio
3.1 KHz audio G.711 ??-law Telephony (or no
HLC)
audio RTP/AVP 0 AS:64 rtpmap:0 PCMU/8000
3.1 KHz
audio
3.1 KHz audio Facsimile Group 2/3 image udptl t38 AS:64
3.1 KHz
audio
3.1 KHz audio Facsimile Group 2/3 image tcptl t38 AS:64
64 Kbps
unrestricted
Unrestricted digital
info with tone
announcement
audio RTP/AVP 9 AS:64 rtpmap:9 G.722/8000
64 Kbps
unrestricted
Unrestricted digital
info
audio RTP/AVP AS:64 rtpmap:
CLEARMODE/8000
TABLE 5.8 Mapping Between SS7 USI and the SIP SDP (SS7 Origination)
129
130 Chapter 5
The CSCFs determine the routing of a SIP request based on the URI provided by the
subscriber device (and contained in the SIP request).
To establish a session, the originating subscriber device must first generate an
INVITE message with a destination address in the form of either a SIP URI or a TEL
URI. If the INVITE is to be directed outside of the IMS and into the legacy network,
then the destination address will take the form of a TEL URI. The CSCFs will eventually
route the request to the BGCF/MGCF for routing into the legacy network. The
BGCF/MGCF will determine how to route the INVITE into the legacy network according
to this address.
The INVITE must then be routed through the network to the destination device.
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