asterisk users - May 2014 - pulseaudio question and console

If I login as a user and run asterisk it connects to pulse and runs.

if I login as root and run the command
su user -c "asterisk -vvvvvc"

it does not connect to pulse and run.
I thought su ran as that user - am I missing something to get the su
command to run
correctly and connect to pulseaudio as that user.

Thanks,

Jerry
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