NAT/firewall traversal for SIP: issues and solutions

Constantinescu, Mihai; Croitoru, Victor; Cernaianu, D. Oana

doi:10.1109/isscs.2005.1511292

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Traditionally, NAT devices are used to connect an isolated address realm with private unregistered address to an external realm with globally unique registered addresses". [2] NAT was designed as short term solution for the IPv4 address exhaustion to allow multiple hosts in a "private" network to share public IP addresses while a more permanent solution is being developed. Because of its intended temporary nature it has been designed to cause minimal network changes and without making any changes to hosts or other routers.…”

Section: Network Address Translators (Nat)mentioning

confidence: 99%

Performance Analysis for VoIP NAT Traversal in a Secured SIP System

Elbayoumy¹,

Ehab²

2011

International Conference on Aerospace Sciences and Aviation Tec

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Voice over IP technology has rapid growth on network convergence in deployment of converged networks within enterprises. Most enterprises today sit behind Firewalls and also use private IP addressing behind NATs (Network Address Translators). These NATs cause significant problems for multimedia over IP to work and function properly. The de-facto Internet standard Internet Protocol (IP) is not secure. All types of business conducted through Internet, raised the requirement for a secure protocol. IP Security Working Group of IETF has been working on IPSec (IP Security) protocols to protect the IP traffic on the packet level. There are problems faced when an IPSec traffic is intended to pass through a NAT device. NAT and IPSec is very hard to use together without a standard way which would provide simple management and interoperability between vendors. Nowadays there are many techniques and solutions are used to allow popular applications to work through NATs. In this paper we present the details of the problem and issues associated with NATs and then survey some ways to solve this problem in SIP which aspire to become the dominant protocol on the internet for establishing calls. As a case study, we simulate a VoIP network and study the behavior and quality of VoIP under this model. We study all the potential parameters that can deteriorate the quality of VoIP such as jitter, End-To-End delay, packet delay variation, and the effect of adding security to VoIP networks that has been measured using OPNET (Network Simulation Tool).

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Section: Network Address Translators (Nat)mentioning

confidence: 99%

Performance Analysis for VoIP NAT Traversal in a Secured SIP System

Elbayoumy¹,

Ehab²

2011

International Conference on Aerospace Sciences and Aviation Tec

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“…By modifying network address information stored in packet header when packets pass through a traffic routing device, NAT remaps a given address realm into another, while also providing transparent routing for the hosts behind a NAT. The nature of NAT causes NAT traversal problem Aurel Constantinescu et al, 2005;Ho et al, 2011), which is a barrier to P2P applications. Not until an internal host (IH) behind a NAT device sends a packet to an external host (EH) outside the NAT first can the EH send packets to the IH directly.…”

Section: Introductionmentioning

confidence: 99%

Can: A context-aware NAT traversal scheme

Tseng

Lin

Yen

et al. 2013

Journal of Network and Computer Applications

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“…The breaks the NAT barrier and its performance behind NAT is authenticated user will have the presence in the MCS server, considered to be very satisfying and moreever it doesn't When the user wants to commincate to the other user,first of require any third party NAT clients, wheras this is not the all the user has to get the user's list from the MCS server, if same case with Session Inititaion protocol(SIP), it does require the user is on-line then only the conference can be activated the NAT clients. Though the SIP is having trouble in reaching Even if the user is not online he will get notified about the behind NAT clients [7]. called iniviation.…”

mentioning

confidence: 99%

Multimedia Communication: RSW Control Protocol and IAX

Kolhar

Wan

Abouabdalla

et al. 2008

2008 International Symposium on High Capacity Optical Networks and Enabling Technologies

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Multimedia communication has become basic considering the InterAsterisk eXchange protocol as there VoIP necessity of internet users. It has become more and more relevant protocol.in distributed environments. There are many protocols available This paper is having 4 sections; II gives details of RSW and in IP telecommunication world for signaling and control of IAX about signaling and data protocols. III gives the Internet telephone calls. InterAsterisk eXchange protocol and comparison study of these two protocols. In IV we discuss and RSW are considered to be major protocols for signaling and data.propose possible architecture to bridge them together to have These two protocols provide competitive voice and video seamless end to end connectivity. Lastly we conclude the functionality using different mechanisms and provide similar paper. quality of service. Both protocols have been in use in very big way. This paper surveys protocol functions and mechanism for II. MULTIMEDIA PROTOCOL media transmission and signaling of these two protocols. This paper intended to introduce possibility of bringing together.

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NAT/firewall traversal for SIP: issues and solutions

Cited by 6 publications

References 8 publications

Performance Analysis for VoIP NAT Traversal in a Secured SIP System

Performance Analysis for VoIP NAT Traversal in a Secured SIP System

Can: A context-aware NAT traversal scheme

Multimedia Communication: RSW Control Protocol and IAX

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