Testing SIP/H.323 connection over unmanged networks

Discussion related to the development, deployment, and use of test equipment for multimedia communication systems
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swinster
Posts: 2
Joined: Mon Oct 11, 2010 4:35 pm

Testing SIP/H.323 connection over unmanged networks

Post by swinster »

Hi all,

What are the possibilities for testing and analysing potential issues over unmanaged networks? I.e. SIP or H.323 call made over the internet where transient condition may mean that calls are subject to several packet loss yet these loses cannot be attributed to either ends local network?

I fear that not much information may be gleaned but if certain statistic could be produced to potentially show congestion between given hops, then this would be highly useful in attempting to get the problems resolved with the network providers.

Not sure if a simulators would be useful in such a situation?

Cheers
Chris,
Welsh Video Network
tsahil
Posts: 5
Joined: Mon Oct 11, 2010 6:30 pm

Re: Testing SIP/H.323 connection over unmanged networks

Post by tsahil »

Hi,

There are techniques to handle that.
You might want our own VQ SDK/Monitor solutions: http://www.radvision.com/Products/Devel ... o-Quality/
They are geared towards analyzing real-time video and determining the quality of it.

There are also a few posts and webinars I can direct you to on this subject.

Regards,
Tsahi Levent-Levi
RADVISION
http://VoipSurvivor.com
Tsahi Levent-Levi
CTO, Technology Business Unit
RADVISION
Blog: http://www.VoipSurvivor.com
swinster
Posts: 2
Joined: Mon Oct 11, 2010 4:35 pm

Re: Testing SIP/H.323 connection over unmanged networks

Post by swinster »

Many thanks. Oddly, I was looking through the some of the Radvision products (amongst others) last night.

The statistical feedback from the hardware endpoints we use (mainly Polycom and Tandberg) are simply not sufficient for pinpointing issues - they simply tell us that invariably packets have been lost. The same goes for the statistical feedback we have access to from the third party MCU we use. Whilst the endpoints and gatekeepers/boarder controls are within out control, and we should be able to gain access to the local network segments these reside on (even though the local networks themselves are not our directly), the MCUs we utilise are owned by a third party, and the intermediate networks are not within our control at all (yet is probably the most likely cause of issues we encounter)

Whilst we can capture packet traces at the endpoints either by tapping in to the stream or simply running a software endpoint and a traffic analyser (such as wireshark), these don't really tell us what has happened at each point across the unmanaged network. One of the most useful tools we have used is a fairly rudimentary tool that effectively plots the time delays from trace-route/ping requests.

Any further documentation you can point us to would be useful.
Chris,
Welsh Video Network
tsahil
Posts: 5
Joined: Mon Oct 11, 2010 6:30 pm

Re: Testing SIP/H.323 connection over unmanged networks

Post by tsahil »

Chris,

The best way for me to assist you is by connecting you with the relevant PM here.
Just follow the link to my blog and send me your email through the contact page - I'll have the PM email back to you to arrange a call.

Regards,
Tsahi Levent-Levi
RADVISION
http://VoipSurvivor.com
Tsahi Levent-Levi
CTO, Technology Business Unit
RADVISION
Blog: http://www.VoipSurvivor.com
rodssmith
Posts: 10
Joined: Mon Aug 22, 2011 12:02 pm

Re: Testing SIP/H.323 connection over unmanged networks

Post by rodssmith »

if you need any kind of technical help, this might help you.
Thanks

sip trunking | sip service provider
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