Comment 35 for bug 330766

This is an old bug but the issue remains if mounting homefolder with cifs.
If unix extensions are not enabled in samba pulseaudio cannot create a symlink to /tmp.

To workaround this you can use solution #34 (https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/330766/comments/34) or use the bind command (no need of an extra partition):

e.g. mount --bind /tmp/volcano /home/volcano/.pulse

For even more flexibility use pam_mount:
e.g <volume path="/tmp/%(USER)" mountpoint="~/.pulse" options="bind" />

Please note: the folder /tmp/volcano has to exist with owner:group volcano:volcano.