No, that is not likely. If you want to connect 3rd party devices generally you need to use standard IPSec with pre-shared key using a wildcard address, or certificates if they support that. But I don't know about IP phones.
With EasyVPN you only need one VPN server, it supports all EasyVPN clients, routers and firewalls in network extension mode as well as VPN clients.
You can also combine EasyVPN and normal IPSec tunnels on one VPN server.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...