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VoIP Over GPRS Using a SIP-Enabled Mobile Device

IP.com Disclosure Number: IPCOM000131827D
Publication Date: 2005-Nov-21
Document File: 1 page(s) / 41K

Publishing Venue

The IP.com Prior Art Database

Abstract

There is currently no alternate choice on a mobile device to make inexpensive call using Voice over IP (VoIP) technology without comprising acceptable voice quality or quality of service levels. The existing data overlay layer known as GPRS provides a transport layer for data communication over existing GSM networks. GPRS is data format agnostic (i.e., to supports any type of data format), which means that voice data can be encoded into data packets (i.e., packetized) and sent over a GPRS link using the SIP protocol to any other SIP-enabled receiving devices. Examples of SIP devices include mobile devices, PSTN phones (through a carrier-provided SIP gateway) and an enterprise PBX desk phone (through a SIP gateway provided by the enterprise). One useful packetized voice communication protocol implemented on Voice-Over-GPRS is Push-to-Talk (PTT). Push-to-Talk is currently implemented and deployed by several large US wireless networks. One limitation of Push-to-Talk (PTT) is that it is only an on-net communication and does not support off-net calls. The proposed solution is to retain GPRS as the transport layer over which mobile devices deploy an SIP stack for signalling messages and to use the RTP stack for voice media. Between GPRS and SIP/RTP will be a linking data layer (e.g., UDP). This implementation will ensure its compliance with industry standards and enable interoperability with existing SIP Gateways (e.g., Nortel, Cisco, SIP Server, to be deployed by carriers). Considering mobile devices which implement SIP technology for voice communication (e.g., over WiFi), it will be easy and cost-effective to deploy the SIP stack over GPRS.

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VOICE OVER GPRS

VoIP Over GPRS Using a SIP-Enabled

Mobile

Device

Disclosed Anonymously

There is currently no alternate choice on a mobile device to make inexpensive call using Voice over IP (VoIP) technology without comprising acceptable voice quality or quality of service levels.

The existing data overlay layer known as GPRS provides a transport layer for data communication over existing GSM networks.  GPRS is data format agnostic (i.e., to supports any type of data format), which means that voice data can be encoded into data packets (i.e., packetized) and sent over a GPRS link using the SIP protocol to any other SIP-enabled receiving devices. Examples of SIP devices include mobile devices, PSTN phones (through a carrier-provided SIP gateway) and an enterprise PBX desk phone (through a SIP gateway provided by the enterprise).

One useful packetized voice communication protocol implemented on Voice-Over-GPRS is Push-to-Talk (PTT). Push-to-Talk is currently implemented and deployed by several large

US

wireless networks. One limitation of Push-to-Talk (PTT) is that it is only an on-net communication and does not support off-net calls.

The proposed solution is to retain GPRS as the transport layer over which mobile devices deploy an SIP stack for signalling messages and to use the RTP stack for voice media. Between GPRS and SIP/RTP will be a linking data layer (e.g., UDP). This implementation will ensure its compliance with industry standards and enable interoperability with e...