[VoiceOps] Geographic redundancy

Kenny Sallee kenny.sallee at gmail.com
Wed Aug 12 02:37:05 EDT 2009

OK I see - from a CLEC perspective - is it a legal requirement to do so?
I've read some of this tonight:
http://www.voip-info.org/wiki/view/How+to+start+a+Clec and although it's
mentioned a bit I'm not clear on if it's a legal requirement of a CLEC (or
just implied because in 1996 that's just the way it was)

ITSP vs CLEC redundancy sounds like it's quite different then - if you must
have SS7 links.

>From an ITSP perspective - redundancy sounds like it comes down to IP
latency between signalling entities  and their capabilities, hardware, and
cash (like mentioned below).

Along those lines - I'm reading up on BW and geographical HA...
-- anyone out there actually who has actually implemented it - if so what's
your experiences if you can share on list?

On Tue, Aug 11, 2009 at 11:14 PM, Alex Balashov
<abalashov at evaristesys.com>wrote:

> Kenny Sallee wrote:
> On a curiosity note - why would you even need to interconnect with SS7 to
>> the PSTN when you can SIP peer to all the major carriers?  There can be an
>> argument for backup to SIP peering that makes sense.  Maybe it's cheaper?
>>  But outside of those what other benefits are there (don't misread my tone
>> here - I'm really asking)?
> If you're just an ITSP, you may not need to, strictly speaking.  But if
> you're a CLEC, you do, and the original question seemed to be heavily
> concerned with making CLEC facilities redundant.
> Beyond that, it's a matter of opinion.  My experience has been that SIP
> peering isn't terribly mature;  reliability and interop issues abound. I've
> had a number of high-volume customers that gave up and went to TDM access
> circuits after they realised that their top tech people spend 90% of all
> days dealing with SIP issues from their O/T providers.
> It's the usual litany of crap.  formatting differences (E.164 vs.
> ten-digit), buggy in-band DTMF, very buggy RFC2833 (out-of-band) DTMF,
> caller ID and CNAM (From vs. Remote-Party-ID vs. P-Asserted-Identity), QoS,
> one-way audio, dropped calls, DSP bugs in ISDN<->VoIP gateways, etc.  When
> they move to TDM these problems seem to magically go away.
> But I have other customers that just don't seem to have a lot of these
> problems, either.  It's a coin toss.
> --
> Alex Balashov
> Evariste Systems
> Web     : http://www.evaristesys.com/
> Tel     : (+1) (678) 954-0670
> Direct  : (+1) (678) 954-0671
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