[Serusers] Help with SER & 10 users

[Aster]

Hello All,

I am new SER and trying to get information on how it work. 
Before i sign up for this list, i was regular lucker of the mailing list.

I know this subject has been discussed lot of times but i find the
proper answer for this.
I guess some will be able to help me with what i am trying to do.

I am planning to have about 10 users connected to SER server and then
they should be able to call any number they wish. I mean to outside
world.

Instead of having 10 different account for this purpose, i would like
to have one account and have them use the same account to make
outbound calls. I don't like to give them the login/password to the
main account.
Can i have a SIP provider (like voicepulse) register to my SER server
and then all the 10 users connect to outbound calls through SER?

Please help me to get this working.

TIA