[VoiceOps] Geographic redundancy
abalashov at evaristesys.com
Wed Aug 12 02:14:07 EDT 2009
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.
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