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VoIP monitoring and troubleshooting: Difference between revisions
VoIP monitoring and troubleshooting (view source)
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More often than not, VoIP services and traffic are passing through the very same infrastructure components that also handle your regular server/end-point communication. Thankfully VoIP is a rather low-bandwidth type of communication (E.g. codec G.711 = 64 Kbps BR* / 87.2 Kbps NEB*). On the other hand however, Administrators better be on their A-game concerning the overall quality of their network, because VoIP relies on impeccable timings and a minimum amount of packet loss. | More often than not, VoIP services and traffic are passing through the very same infrastructure components that also handle your regular server/end-point communication. Thankfully VoIP is a rather low-bandwidth type of communication (E.g. codec G.711 = 64 Kbps BR* / 87.2 Kbps NEB*). On the other hand however, Administrators better be on their A-game concerning the overall quality of their network, because VoIP relies on impeccable timings and a minimum amount of packet loss. | ||
*BR = Bit rate / NEB = Nominal Ethernet Bandwidth (one direction) | *BR = Bit rate / NEB = Nominal Ethernet Bandwidth (one direction) | ||
Allegro Network Multimeter helps network administrators and engineers by providing full visibility into VoIP communications paired with advanced VoIP troubleshooting capabilities. | Allegro Network Multimeter helps network administrators and engineers by providing full visibility into VoIP communications, paired with advanced VoIP troubleshooting capabilities. | ||
VoIP monitoring and analysis with Allegro Network Multimeters can be done in real-time and back in time. | |||
==Global SIP statistics== | ==Global SIP statistics== | ||
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==Getting a pcap from SIP, RTP, RTCP== | ==Getting a pcap from SIP, RTP, RTCP== | ||
We've learned from network administrators and engineers that it is not an easy task to capture and view the SIP and its corresponding RTP of a call in Wireshark. Especially on Links where multiple calls were active. This is however very easy with an Allegro Network Multimeter. Next to each individual call on the Voip Calls screen (and on the call Details page), you will find several download buttons. Herewith the corresponding and correlated data can easily be extracted and downloaded as a pcap. Whether you are interested in viewing just the SIP flow in Wireshark, or retrieve a calls’ correlated SIP+RTP+RTCP all in one cleanly filtered PCAP for post analysis. It’s all just 1 click away in the Allegro Network Multimeter. | We've learned from network administrators and engineers that it is not an easy task to capture and view the SIP and its corresponding RTP of a call in Wireshark. Especially on Links where multiple calls were active. This is however very easy with an Allegro Network Multimeter. Next to each individual call on the Voip Calls screen (and on the call Details page), you will find several download buttons. Herewith the corresponding and correlated data can easily be extracted and downloaded as a pcap. Whether you are interested in viewing just the SIP flow in Wireshark, or retrieve a calls’ correlated SIP+RTP+RTCP all in one cleanly filtered PCAP for post analysis. It’s all just 1 click away in the Allegro Network Multimeter. The slicing of recorded packet data is supported and fully customizable within the Allegro Network Multimeters. For instance, one may want to slice RTP packets after the first 128 bytes to eliminated the possibility for listening in on conversations. | ||
[[File:Sip rtp download.png|none|thumb|800x800px]] | [[File:Sip rtp download.png|none|thumb|800x800px]] | ||
[[File:Wireshark SIP RTP.png|none|thumb|800x800px]] | [[File:Wireshark SIP RTP.png|none|thumb|800x800px]] | ||
==Audible VoIP troubleshooting (MP3)== | ==Audible VoIP troubleshooting (MP3)== | ||
Crackling, echoing or muffled audio may very well not be due to the network. Unfortunately these specific things also cannot be derived from the information in the audio Level graph. It’s cases like this for which the Allegro Network Multimeter provides the download buttons Audio1 and Audio2. Where allowed or where troubleshooting benefits outweigh privacy constraints, the administrator/engineer may want to download the call audio, per direction, as an MP3. This helps troubleshoot certain issues and provides audible evidence of a bad headset (cable), terrible car kit or other things alike. | Crackling, echoing or muffled audio may very well not be due to the network. Unfortunately these specific things also cannot be derived from the information in the audio Level graph. It’s cases like this for which the Allegro Network Multimeter provides the download buttons Audio1 and Audio2. Where allowed or where troubleshooting benefits outweigh privacy constraints, the administrator/engineer may want to download the call audio, per direction, as an MP3. This helps troubleshoot certain issues and provides audible evidence of a bad headset (cable), terrible car kit or other things alike. As already once stated above...the slicing of recorded packet data is supported and fully customizable within the Allegro Network Multimeters. For instance, one may want to slice RTP packets after the first 128 bytes to eliminated these possibilities for listening in on conversations. | ||