![]() Line 2 Registration Denied - The Proxy requests additional data (i.e. Line 1 Registration Denied - The Proxy requests additional data (i.e. The Biamp VoIP device tries to register Line 2 (ext 530) with the Proxy using anonymous credentials The Biamp VoIP device tries to register Line 1 (ext 520) with the Proxy using anonymous credentials Within this capture, we can see the sequence of successfully connecting to the Proxy, negotiating the media settings, placing a call, and then terminating the call.Ī breakdown of the negotiation process is as follows: Line The capture below shows a Biamp VoIP device at IP Address 10.21.12.73 registering two of its lines to a Proxy at IP Address 10.21.12.20. These include Biamp VoIP products, a VoIP desk phone, VoIP software (softphone) and other 3 rd party manufactures VoIP devices, of which there are many. Once the SIP protocol has negotiated the connection and a call is initiated, the Real-Time Transport Protocol (RTP) is responsible for packaging the audible voice and any control data (such as DTMF tones) and transporting them across the network.Īn endpoint is defined as any VoIP device able to accept incoming or make outgoing VoIP calls. It does this by the devices exchanging three types of messages – requests, and then responses to those requests, as well as various information and call progress ‘update’ type messages. The protocol is responsible for the establishment, control and termination of VoIP sessions. SIP is the most commonly used signaling protocol by VoIP devices and vendors today. This includes registration, authentication and implementing the rules and parameters to establish and route the calls to their correct destinations.īiamp VoIP devices communicate this call handling information to the Proxy using the Session Initiation Protocol (SIP). The Proxy, sometimes referred to as the Call Manager, Session Manager or VoIP server, is the device responsible for setting up and negotiating the call handling process. Note that this is a follow up resource to the How to perform a Wireshark trace of a Biamp VoIP device article which covers the procedure for actually obtaining a packet capture.Īs part of troubleshooting a Wireshark trace it is important to understand the devices and protocols VoIP uses. This article explains how to analyze the Wireshark trace. Analyzing these traces may seem daunting at first however this article aims to simplify the process. If this is the case, Wireshark can be used to help locate the point of failure. Possible causes can include communications issues over the network or issues with the configuration of the Proxy Server. The registration process may be hindered by something beyond the VoIP device itself. If a Biamp VoIP device is placed on a VoIP Network, but not registering with the Proxy Server, calls fail or some other issue is being reported determining the point of failure can be difficult using the Biamp software alone. A program called Wireshark is a free, open-source packet analyzer that is used for network troubleshooting and analysis. ![]() This article will describe the process of reading a packet capture of communications between a Biamp VoIP device and the VoIP network. ![]()
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