VOIP Assistance / Setup

Require a VOIP expert to assist in a pretty quick matter. We have 2 companies. Each company will have a main telephone number with auto-attendant. We want to install and operate a virtual PBX (Asterix/Trixbox)from a spare PC in our office. All employees will be given an extension and DDI (from which they can dial out). Therefore calls will be recived and made. All employees will be multi-site based. Some employees will have softphone, some will have ATA devices (SNOM/Linksys) 1. Looking for a reputable provider in the UK for VOIP 2. That can handle this setup You'll be asked to do the setup (or assist). When bidding, please ask any questions.