From David Bowes BA BAI MBA CEng MIMechE, Indigo Engineering Ltd.
I use SIPSorcery to ensure I'm appropriately available wherever I'm working, selectively sending callers to my mobile, home office, workplace at clients, or to voicemail.
When you need it with SIPSorcery the technical support is outstanding.
As well as the call management I've used SIPSorcery to save hundreds of pounds when calling businesses, friends and relatives around the world over the past few years.