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Introduction
Vega can relay "User-To-User IE" from SIP INVITE to PRI/ISDN SETUP message and vice versa.
Below contents will describe the required configuration for Vega to send/receive "User-To-User" IE to/from ISDN/SIP.
Configuration
Vega needs to have below parameter set in order to pass "XUUI" SIP Header received in SIP INVITE to ISDN SETUP and vice-versa.
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HINT: Possible Values of advanced.sip.q931.tx_tun_mode parameter are off | cirpack | cirpack_space | xuui | user_to_user
Sending UUI from SIP to ISDN
In order to populate "User-to-User" IE in SETUP message , SIP server needs to send below format "XUUI" message in SIP INVITE.
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SETUP message sent by VEGA after getting above X-Uui will looks like as below -
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Sending UUI from SIP to ISDN
VEGA will add "X-UUI" SIP header in outgoing INVITE whenever it received "User-User" IE in incoming SETUP message.
"X-UUI" format will be same as defined while sending the same header from SIP to VEGA.
Examples:
SIP side wants to send "12859888-3689057700-617952@xyz.mydomain.com;encoding=text" so here "@"/";"/"=" needs to be converted into ASCII hex format for vega to recognize these character and send over PRI.
Original Header Value:
12859888-3689057700-617952@xyz.mydomain.com;encoding=text
Note: This is what the SIP side wants to send in the User-User IE.
Using the X-Uui Header
X-Uui: user-information=12859888-3689057700-617952%40xyz.mydomain.com%3Bencoding%3Dtext
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