Mobile IP telephony services can be separated into three broad categories, each with its own specific target markets and technologies used. These categories are illustrated below:
Tested use cases for the built-in VoIP client on the HP iPAQ 500 series smartphone cover the enterprise VoIP segment exclusively and expect the enterprise has IT staff that manage their own IP-PBX systems and provision devices for enterprise users. Mobile enterprise VoIP services should be accessible anywhere the VoIP-enabled enterprise wireless local area network (WLAN) provides coverage, typically within company buildings and possibly around corporate campuses. Using the built-in VoIP client for mobile access to the company’s IP-PBX from remote locations (homes, hotels, Internet hotspots, etc.) is not a supported capability.
HP uses the native Microsoft SIP (Session Initiation Protocol) client in Windows Mobile 6 to access VoIP services, and this SIP client’s capabilities and limitations have been further split into the following categories for the purposes of this document:
Media and Signaling Protocols
Telephony Features