OpenSIP: Toward Software-Defined SIP Networking
Ahmadreza Montazerolghaem, Mohammad Hossein Yaghmaee, Alberto, Leon-Garcia

TL;DR
OpenSIP integrates SDN and NFV with deep packet inspection to enhance SIP routing, management, and load balancing, addressing traditional limitations in VoIP networks with a scalable, cost-effective solution.
Contribution
This paper introduces OpenSIP, a novel framework combining SDN, NFV, and DPI to improve SIP network efficiency and management, which was not addressed in prior work.
Findings
Low overhead and satisfactory performance on testbed
Effective load balancing and resource management
Scalable architecture for SIP networks
Abstract
VoIP is becoming a low-priced and efficient replacement for PSTN in communication industries. With a widely growing adoption rate, SIP is an application layer signaling protocol, standardized by the IETF, for creating, modifying, and terminating VoIP sessions. Generally speaking, SIP routes a call request to its destination by using SIP proxies. With the increasing use of SIP, traditional configurations pose certain drawbacks, such as ineffective routing, un-optimized management of proxy resources (including CPU and memory), and overload conditions. This paper presents OpenSIP to upgrade the SIP network framework with emerging technologies, such as SDN and NFV. SDN provides for management that decouples the data and control planes along with a software-based centralized control that results in effective routing and resource management. Moreover, NFV assists SDN by virtualizing various…
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