SERvartuka: Dynamic Distribution of State to Improve SIP Server Scalability

Balasubramaniyan, Vijay A.; Acharya, Arup; Ahamad, Mustaque; Srivatsa, Mudhakar; Dacosta, Italo; Wright, Charles P.

doi:10.1109/icdcs.2008.42

Cited by 12 publications

(1 citation statement)

References 5 publications

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“…All these proxy servers are written in the C language, use standard processbased concurrency with shared memory segments for sharing state, and are considered to be highly efficient. These sets of server implementations represent the de facto open source version of SIP server, occupying a role similar to that of Apache for web server [4,6,13,14,16,17,24,30,42].…”

Section: Opensips Sip Servermentioning

confidence: 99%

The impact of TLS on SIP server performance

Shen

Nahum

Schulzrinne

et al. 2010

Principles, Systems and Applications of IP Telecommunications

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Securing VoIP is a crucial requirement for its successful adoption. A key component of this is securing the signaling path, which is performed by SIP. Securing SIP is accomplished by using TLS instead of UDP as the transport protocol. However, using TLS for SIP is not yet widespread, perhaps due to concerns about the performance overhead. This paper studies the performance impact of using TLS as a transport protocol for SIP servers. We evaluate the cost of TLS experimentally using a testbed with OpenSIPS, OpenSSL, and Linux running on an Intel-based server. We analyze TLS costs using application, library, and kernel profiling, and use the profiles to illustrate when and how different costs are incurred, such as bulk data encryption, public key encryption, private key decryption, and MAC-based verification. We show that using TLS can reduce performance by up to a factor of 17 compared to the typical case of SIP-over-UDP. The primary factor in determining performance is whether and how TLS connection establishment is performed, due to the heavy costs of RSA operations used for session negotiation. This depends both on how the SIP proxy is deployed (e.g., as an inbound or outbound proxy) and what TLS options are used (e.g., mutual authentication, session reuse). The cost of symmetric key operations such as AES, in contrast, tends to be small.

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Section: Opensips Sip Servermentioning

confidence: 99%

The impact of TLS on SIP server performance

Shen

Nahum

Schulzrinne

et al. 2010

Principles, Systems and Applications of IP Telecommunications

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Network convergence and QoS for future multimedia services in the VISION project

et al. 2012

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Keywords:Network convergence Multimedia services Quality of serviceThe emerging use of real-time 3D-based multimedia applications imposes strict quality of service (QpS) requirements on both access and core networks. These requirements and their impact to provide end-to-end 3D videoconferencing services have been studied within the Spanish-funded VISION project, where different scenarios were implemented showing an agile stereoscopic video call that might be offered to the general public in the near future. In view of the requirements, we designed an integrated access and core converged network architecture which provides the requested QpS to end-to-end IP sessions. Novel functional blocks are proposed to control core optical networks, the functionality of the standard ones is redefined, and the signaling improved to better meet the requirements of future multimedia services. An experimental test-bed to assess the feasibility of the solution was also deployed. In such test-bed, set-up and release of end-to-end sessions meeting specific QpS requirements are shown and the impact of QoS degradation in terms of the user perceived quality degradation is quantified. In addition, scalability results show that the proposed signaling architecture is able to cope with large number of requests introducing almost negligible delay.

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