User`s guide
Dialogic
®
1000 and 2000 Media Gateway Series User’s Guide 79
Parameter Reference
Lines 5 and 6 specify that multipart MIME is appended to the INVITE message and that it uses
MIME version 1.0. Line 6 defines the boundary between MIME bodies; in our example the
boundary is the string ?(boundary)*.
Line 17 starts the first MIME body. This body sends SDP (session description protocol) to the SIP
endpoint. We are not concerned with this.
Line 29 starts the second MIME body. This body sends the ISDN information element’s data. Lines
30-32 describe the body to allow the SIP endpoint to decode it. Line 30 states the MIME body
version. Line 31 says that processing the MIME body is optional. This allows for the case when
some SIP endpoints need the ISDN information element but others don’t. Line 32 specifies the
content of body as an ISDN information element number 77 (hex). Each data byte of the
information element is translated into two hex digits, line 34. Line 36 simultaneously ends the
second body and the multipart MIME.
France Telecom’s IE77
Description: Allows propagating an ISDN Information 77 (hex) from an ISDN SETUP message to
a SIP INVITE.
Allowed Values:
• Yes = Information Element 77 (hex) is included in a SIP INVITE message.
• No = Information Element is ignored.
Default Value = No (preserves pre Version 6.0 SU8 Software behavior)
INI File Parameter Name = gwIsdnIe77Enable
Format of MIME body that encapsulates Information Element 77 (hex)
1 Content-Type: application/ISUP; version=Dialogic-DMG2000-v1
2 Content-Disposition: signal ; handling=optional
3 Content-Description: ISDN IE 77h
4
5 37 31 36 35 35 35 36 35 35 32
6
Line 5 is the IE’s data. Each byte within the IE is translated into two ascii hex digits.