How to integrate the enterprise IP Telephony System with SIP Trunking Provider for external voice call routing?

The move to Voice over IP (VoIP) and Fax over IP (FoIP) in the enterprise has, ... Telephony Service Providers (ITSPs) to connect their internal networks to ... IP communication services at the enterprise edge between the external and internal .... A SIP trunk is primarily implemented as a set of concurrent call sessions routed

SIP Networking Services and Trunking are an important new category of networking capabilities for enterprises seeking to achieve new efficiencies in their network design, cost reductions for WAN networking and enablement of a new wave of SIP enabled applications. SIP networking offers are appearing now in the Service Provider marketplace with a growing number of carriers bringing SIP WAN capabilities to your enterprise locations. 

Dear Mr. samir abdulrahim ,

Thanks for your input which is very informative. Currently we don’t have any ITSP provider available in our area.

Regards,

Shameer