[Freeswitch-users] difference between bridging with 'user/XXXX at YYYY.com' and ${sofia_contact(XXXX at YYYY.com}

[Vik Killa]

what is the difference between bridging to a UA using
'user/XXX at xxx.com' and ${sofia_contact(XXX at xxx.com} ?
i noticed things like presence (esp. with SLA) work better with user/XXX at xxx.com
I also noticed the pickup dialplan app (,pickup/XXX at xxx.com) doesnt
work with the 'user/XXX at xxx.com'
it only seems to work with sofia_contact bridge
Can anybody test or verify this?
Thanks.
RJ