Conference Bridge Service Providers

[Crombers]

Can anyone recommend a good conference bridge service provider? As an independent contractor I often find clients don't have a process for issuing bridges to non-employees. Having struggling with this on more than one occasion and to avoid having to beg borrow and steal one I would like to procure my own.

I'm open to both free and chargeable solutions, flexible on add-ons such as call recording or desktop sharing capability.

Any suggestions?