We have an SMB client who wants to terminate two SIP trunks from an ITSP into their exitsing IP PBX system. I want to know what Cisco product will be required to achive this. We have other customers with same scenario but they are using ISRs (e.g: 1921, 1941, 2901) to achive this funcationality. Buying an ISR for SMB is not very cost effective. I see Cisco Small Business Voice Gateways (SPA2102, SPA8000) are not going to achieve this functionality. Can anyone suggest me a better cost effective solution?