This may help. It's a quote from an OBi Support post, which never made it into the AdminGuide:
You may now append these URL parameters to speed dial and SIP Gateway VG1-8 access number, separated by ';'
- ui=userid[:password]
- ui=user-info, password is optional
- op=[ i ][ m ][ n ][ s ] ;option flags, i=ice, -m=symmetic-rtp, n=natted-address, s=stun
Examples:
SpeedDial = sp2(1234@sip.inum.net;ui=1000:xyz;op=sm)
VG1-8 AccessNumber = SP1(sip.inum.net;user=1000;op=imns)
Note that if userid or password is specified in VG1-8 AccessNumber, it overwrites the settings in AuthUserID, and AuthPassword in the VG.