... of network elements, access and transport IP networks, protocols, and system architecture must scale well to support hundreds of 134 CONCLUSIONS AND CHALLENGES thousands of customers without a¤ecting ... and 136 CONCLUSIONS AND CHALLENGES ITU-T, work groups of IETF, MSF, and the International Softswitch Consortium (ISC), IEEE (standards.ieee.org), Cable Labs (www.cablelabs.com/ projects/), and the ... for delivering the caller’s name and number, voice message, and so on to an IP phone from a PSTNhosted feature server and voice mail box, respectively, and (d) GWs and/ or servers to support interactions...