[VoiceOps] GLBX soft switch

Scott Berkman scott at sberkman.net
Wed Aug 5 10:43:08 EDT 2009

Technical concepts are often different from Marketing terms.

	At my last company we used the term "SIP Trunking" to refer to
configured SIP connectivity to an end customer's equipment, generally
limited by a network element to a specific number of maximum concurrent
calls with one form or another of flat-rate pricing.  "Virtual PRI" is a
good analogy.

	We used the term "O&T" (Origination and Termination) to refer to
wholesale SIP arrangements to another carrier/large customer's switch that
was metered (pay for all calls) and was not limited (by anything other than
available bandwidth and upstream PSTN trunks) in terms of concurrency.  This
would equate to carrier SS7 and ISUP trunks in the PSTN.

	Perhaps a good analogy is "Peering" vs. "Transport" or "Transport"
vs. "Internet Access" in the IP connectivity world.  They are all just pipes
for moving packets but they come with different agreements and pricing,
often due to the "size" of the deal, and they are often provisioned very
differently from a technical/facilities standpoint.


-----Original Message-----
From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
On Behalf Of Ric Messier
Sent: Wednesday, August 05, 2009 10:05 AM
To: Alex Balashov
Cc: voiceops at voiceops.org
Subject: Re: [VoiceOps] GLBX soft switch

On Wed, 5 Aug 2009, Alex Balashov wrote:

> SIP trunking simply refers to a static arrangement of IP endpoints for the

> purpose of setting up multiple sessions between them in order to pass 
> traffic.  It can either be access (for a customer) or traffic of an 
> intra-industrial nature, such as private SIP peering between carriers or 
> ITSPs.

I'm familiar with what SIP trunking is. You're right that it's imprecise. 
However, the carrier/service provider I used to work for did make a 
distinction, as I recall. Ultimately, the mechanism is the same or at 
least similar (different facilities may be used).


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