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1000 and 2000 Media Gateway Series User’s Guide 75
Parameter Reference
SIP-ISDN and ISDN-SIP Calls
For calls between SIP and ISDN, the UUI is translated between formats. SIP UUI headers are
translated to ISDN UUI information elements and ISDN UUI information elements are translated
to SIP UUI headers.
Translation occurs only for specific message pairs. Translation occurs between SIP 'INVITE' and
ISDN 'SETUP', between SIP '180 Ringing' and ISDN 'ALERTING', and between SIP '200 OK' and
ISDN 'CONNECT'.
Figure 10 is an example call flow for SIP-ISDN and ISDN-SIP calls:
Figure 10. Example Call Flow for SIP-ISDN and ISDN-SIP Calls