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ReneGeFlag for Canada

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SIP Trunk provider

Hi there,

I need to know who is the "REAL" SIP trunk provider.

So, I have a SIP trunk provider, that him self, use a provider, that use a provider, that use a provider and then BOOM, the use THE provider that actually processes the calls.  I need to know how to find THAT SIP trunk provider.

Also, is there a way to trace a call just like for example the command tracert?  This could be in order to find the chain of service providers from the originating number to the destination number.  If this does not exist, is there a tool that would do something close to this?

Thanks,
Rene
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arnold
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The "REAL".
Get the feed directly from your local Phone provider.
The "SIP trunk" provider often means that you have an INTERNET feed from any one you choose and then have a SIP trunk provider that offer competitive price/options that you would not otherwise get from your local....

a "SIP trunk" is a connecting path for phone over "Ethernet".

Search for the SIP provider and then look at their ratings/reviews etc.
The disadvantages of getting a SIP trunk from a provider that does not connect you to the net is that the SIP trunk provider has not ability to remedy a loss of your Internet Feed. Often when a provider connects you to the Net and Provides you phone/SIP trunk services, they have an SLA that is disclosed and often gets a higher priority that an entity whose connection is internet only.

So if you are getting your intenet feed from the local Telco, or the local Cable provider, getting the VOIP/SIP trunk through them might get you closer, but I am not sure what it is you are looking for with your question.
Hi,

The previous posts told all about the SIP Trunk, what I

For call trace, you can take a network capture and analys the VOIP call refer to the following links:

https://wiki.wireshark.org/VoIP_calls

https://sharkfest.wireshark.org/sharkfest.12/presentations/BI-7_VoIP_Analysis_Fundamentals.pdf

Regards.

Salah
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ASKER

Hi all,

Sorry for taking so long to reply, and thanks for your comments.

Since the packet capture can actually reveal the route, I am surprised that there are no tools out there that actually does the specific job of tracing a call!

Any ideas?

Thanks and cheers :)
The packet usually includes info on the source and destination. Tracing requires knowledge of the path each packet takes which is what you seem to be after.
Using traceroute is a tool to gage possible paths a packet of the message might take.
Hi,

There is many tools that can be used on each context deponding on your need!

Have a look here http://www.voip-info.org/wiki/view/How+To+Debug+and+Troubleshoot+VOIP

Regards.

Salah
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ASKER

Hi Salah,

Perfect :)

Thank you so much!!
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ASKER

Hi Arnold

I was only referring to the tracert DOS command (which I am quite familiar) as a functional reference for what I am looking for here.

Can you please tell me what you mean by your following comment?

Tracing requires knowledge of the path each packet takes which is what you seem to be after.

Thanks and cheers,
Rene
Tracing is you want to know how the packet travelled to get to you? Access to the path to seethe packet glow.
Traceroute is a guesstimate the direct use gives you an indication of the path originating from your side.  Using -G you could have the reverse part guestimate.

All you can do is capture the packets you receive and then based whether there are packets shoeing up out of order, or there are packets already received but keep being retransmitted or delayed.......
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ASKER

Arnold,

Should I then expect that I could receive packets from the SIP or Trunk server that will last deal with my SIP call before being routed to the PSTN, which is my main goal.

Thanks,
Rene
I do not understand what you asked.

Sip provider <=> internet cloud <=> your internet provider <=> your internet connection <=> your PBX

The sip connection is a stateful connection there are continuous "health/status type" checks to maintain that you are still available just in the event a call comes  in it will tge be routed to your pbx. If those "status" packets are not exchanged/received, the sip trunk provider will mark your destination connection as dead and will handle the incoming calls to your numbers either by directing them to voice mail or alternate handling I.e. Forwarding to a cell number that is preset/preconfigured by you with the sip trunk provider.
Or the caller will get a fast busy with some verbal message I.e. Call can not be completed at this time try again later with an internal error indicator message that has meaning to the sip provider.
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ASKER

its more something like this

SIP Device <=> SIP Provider <=> The SIP provider of the SIP provider <=> The SIP provider of the SIP provider of the SIP provider <=> PSTN

I need to know that last one before the PSTN

Cheers
SIP stream is traveling over the internet. how the SIP trunk provider connects to their upstream provider.
You <=> internet
Your Phone <=> Your PBX <=> SIP TRUNK provider via INTERNET
Your provider <=> internet
Your Provider's Provider <=> Internet
.
.
.
Your Provider's Provider's Providers's...... <=> Internet <=> TELCO Provider that is interconnected with another or other telco providers
Internet <=> LOCAL TELCO <=> PSTN LOCAL
PSTN interconnect <=> LOCAL TELCO <=> PSTN LOCAL
Wired phone in home <=> PSTN LOCAL network

Vonage, At&T, and other telco's or Competitive local Exchanges (CLEC) are also providing SIP trunk services.

Most telco's migrating from PSTN to FIOS/Digital data lines as they have to spend money to lay copper that has aged and in need of replacement. So they lay fibre cable and thus increase the services they can offer to the resident from just wired phones which many stopped having to Internet/Cable TV over fios to receive a better return on the cost of laying fibre.

You can not have a phone that is directly connecting to a SIP trunk provider.
A SIP phone connects to a SIP enabled provider.
I do not think a sip phone with multiple lines will signup with a trunk provider versus a sip
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ASKER

Hi Arnold

What about this?

SIP Device <=> Asterisk on LAN <=> Internet  <=> SIP Trunk provider <=> SIP Trunk provider of my SIP trunk provider  <=> TELCO  <=> PSTN

I know my SIP device, I know my Asterisk, I know my SIP trunk provider.  I need to know the other providers.

Thanks for all your help :)

Cheers, Rene
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Salah Eddine ELMRABET
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ASKER

Sorry for taking so long to reply.

So my understanding here, is that there are no tools out there to trace which providers a SIP call is passing through before reaching the destination.

Thanks you two for all your help.  This is greatly appreciated.

Cheers
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ASKER

Thanks
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ASKER

Hi Salah and Arnold,

Sorry for taking so long to reply.

Thanks you sooo much for your help.

Greatly appreciated :)

Cheers mates!