Mitel Forums > Mitel MiVoice Business/MCD/3300

SIP to analogue converters

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ralph:
Let me bounce this off of Y'all.
If you use T.38, standard modems break.   Does anyone agree/disagree?

We've put upgraded one customer with T.38 and afterwards credit card machines and modems no longer worked.   There wasn't a way I found aroung this.   My thought would be to set routes for modems that didn't implement T.38 but I discovered there is no way to do this.   So, if I have a customer that wants to upgrade to T.38 and has modems for monitoring HVAC systems, everything stops.   (I know this is strange but faxes had issues and the modems seems to work.)   

Am I seeing this wrong?   Or, can anyone else make modems work accross a network using T.38.

Also, chandmaynard, could you go into just a little more detail on how you were able to make faxes work with a SIP provider?  Was it SIP to the 3300 then accross the network to a remote 3300?

Ralph

Mattmayn:
We are not using SIP in this situation, the main site has three PRIs and from there it is a standard clustered environment with nine remote sites. There is one Vegastream unit that is hooked to an ASUII (this is where the DNs for the remote faxes reside), the remote end has the other Vegastream unit is hooked directly to the fax machine (does not bring the other 3300 into the picture).

This setup has been in place for two full weeks now and I have not recieved a single complaint, I was getting at least one a day prior to this.

Is that of any help Ralph?

chadmaynard:
Well we are using G.711u-law and T.38 over SIP between the vegastreams. We are using an ASU to provide dial tone to one Vega unit, which converts to SIP, goes across the network to another Vegastream which converts back to analog. If you wanted to use a SIP provider that supports faxing you could use the vega units without the need for the ASU, but it would be a completely separate installation from the 3300.

And as far as modems go... I've seen them work and not work. Mitel's sampling and compression software seems to adjust based on system and network load, and the modem's success seems to relate directly to this as well.

Chakara:
  This is good stuff.  I've done the "analog to device to device to analog" before - but using Multitech devices.  Same game me thinks.  I used the MVP130's and whatever the 4 port version was.  Anyway, it worked - occasionally they report 30-40 page faxes not getting through.  Have you seen problems like this as well?

-Chak

chadmaynard:
I haven't seen any issue yet; though I don't know if they have tried any 40 page transactions.

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