[AusNOG] VOIP PBX Analog card advice

[Andrew Yager]

Hi,

Two real options here; either an ATA for analogue lines (e.g. Mediatrix) -
but I'd caution against this, or the Digium cards. There are other options,
but my experience is that the support/behaviour of these cards is
sub-standard in comparison to the Digium cards.

https://www.digium.com/products/telephony-cards/analog/4-port

The things you particularly need to look out for in analog land is
line-release. Tone detection/release is sometimes hit and miss, although
it's improved a lot in recent DAHDI/Asterisk versions.

The echo cancellation can be tuned, and for local-loop services it should
be OK in most cases. Make sure you read the docs on doing echo training and
be prepared to arse-around with the gain settings to avoid this.

Thanks,
Andrew


On 21 January 2016 at 16:42, paul+ausnog at oxygennetworks.com.au <
paul+ausnog at oxygennetworks.com.au> wrote:

> Hi Matt, thanks for the reply, there is no reasonable infrastructure at
> this location other than DSL and the customer is already on an amazing call
> deal from their current provider so there are good reasons for not moving
> them to a VOIP trunk unfortunately.
>
>
>
> Regards
>
> Paul
>
>
>
> *From:* AusNOG [mailto:ausnog-bounces at lists.ausnog.net] *On Behalf Of *Matt
> Perkins
> *Sent:* Thursday, 21 January 2016 4:35 PM
> *To:* ausnog at lists.ausnog.net
> *Subject:* Re: [AusNOG] VOIP PBX Analog card advice
>
>
>
> Given that most providers can port existing numbers to SIP trunks. I would
> question the wisdom of using Analog Line cards for anything. PSTN has the
> tendency to suffer echo due to impedance mismatching and once you add the
> delay of voip it can be quite noticeable even with top shelf hardware echo
> cancellation.   It's 2016 why not use a SIP trunk.
>
> Matt.
>
>
>
> On 21/01/2016 4:16 PM, paul+ausnog at oxygennetworks.com.au wrote:
>
> Afternoon all, normally we provide SIP only PBX services for customers
> however we have been asked to provide a SIP PBX with Analogue PSTN lines
> for inbound and outbound calls.
>
>
>
> We normally provide Elastix as a simple cost effective PBX for small
> customers and in general it works well for what they need.
>
> I am looking for some wisdom from people who have installed a decent 4
> line card for use with Elastix before quoting the customer as we had
> experience some time ago with timing issues when using analogue cards with
> VOIP handsets.
>
>
>
> Any suggestions would be appreciated.
>
>
>
> Thanks
>
> Paul
>
>
>
>
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>
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>
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>
>
>
>
> --
>
> /* Matt Perkins
>
>         Direct 1300 137 379        Spectrum Networks Ptd. Ltd.
>
>         Office 1300 133 299        matt at spectrum.com.au
>
>                                    Level 6, 350 George Street Sydney 2000
>
>         Spectrum Networks is a member of the Communications Alliance & TIO
>
> */
>
>
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>


-- 
*Andrew Yager, Managing Director* *(BCompSc, JNCIS-SP, MACS (Snr) CP)*
Real World Technology Solutions - IT People you can trust
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