According to InfoTech’s research, the market demand for Hosted IP Telephony will account for more than 25 percent of total telephony line shipments in the next 3-5 years and will grow in revenue from £160 million in 2005 to £3.0 billion by 2010. It is safe to say that in the next two years, every major enterprise and many mid-tier and small business companies will be considering Hosted IP Telephony solutions.

Hosted IP Telephony vs Premises based PBX comparison matrix
 

Feature	Hosted IP Telephony	Premises PBX
Auto failover to mobile or secondary number on loss of primary trunk or head office disaster	Yes	No
Continuity for remote workers on loss of primary trunk or head office disaster	Yes	No
ISDN rental and installation fees	Not required	£5,000 per annum
DDI Number portability during office move	Yes	ISDN would need to be re-installed
Single point for billing	Yes	Multiple bills
Single point of contact for support	Yes	Multiple partners
Remote monitoring of network	Included	Chargeable
Software updates and enhancements	Yes no charge	On site engineering required @ £850 per day
Ability to change phone service at any point	Service provider can be changed easily	Entire phone system would need to be swapped out
Contractual obligation	1 month	5-7 years
Call termination standards (future proofing)	SIP	ISDN will soon be obsolete
Space required for equipment	None	1 Cabinet
Servers required	None	at least 5
Cost of trunk lines per month	£4.50	£15.00
Call charges	Lower than CPS  due to bypassing BT	CPS rates
Software support	Included	Chargeable