AudioCodes MP 124D (MP-11x)
This unit is probably the one most used in Lync Labs to test PSTN connectivity. Actually Drago Totev has written a very detailed HowTo integrate this unit to Lync Server 2010.
Official Site: http://www.audiocodes.com/products/mediapack-1xx
Indicators for each FXO port, power, fail, ready and uplink.
Even the lowly MP-11x series has a power supply inside the unit.
It is plastic (like most in this class) and you can hang it on the wall if needed.
Audiocodes is very active in the Lync world
Nice web GUI
Offers the only fax over https device which is incredibly reliable
We've experience trouble getting audio levels nice (just us?)
Grandstream GXW-4024 (GXW-410x)
This unit is the low cost king.
Official Site: Click Here
Easy to use Web GUI
RJ11 ports as well as 25telco pin adapter
Indicator lights for each port
Cheap (if that is a pro ;-)
Needs rebooted "regularly" to address anomallies
Ports tend to die regularly (every several months)
Patton SmartNode 4900 (SN 411x)
Patton seems to use a similar firmware on all their pstn units which they seem to have fairly hardened.
Official Site: http://www.patton.com/products/pe_products.asp?category=364
All the indicators once again on the SN-411x. This unit is very plastic with no curves to take the edge off that fact. ;-) That is a serial console port there in the front that should not be used under normal conditions.
This unit screams "plastic" and doesn't even sport wall mounts although thankfully it has little rubber feet. ;-) This is one of those units that looks awlful BUT performs like a TANK! We never touch these units after they are installed.
Units run like a tank day in and day out
Patton support will help you config and troubleshoot the units and they have very knowledgeable techs available
Dual power supply option for high density units
Complicated web GUI (figure on using cmd line or config files)
High density PSTN devices do not have RJ11 ports, only 25pin telco
No indicator light per port
Sangoma A200 (variants)
This unit is being embedded in solutions found from other vendors such as snom, HP? (not announced but see this speculation) and likely other vendors and solutions.
Official Site: http://sangoma.com/products/hardware_products/analog_telephony/a200.html
Sell a single PC with all ports inside the unit for a nice package
because of form factor no LEDs for inidividual ports
Ports seems to "blow out" more easily than some other units?
May require a PC reboot reset "stuck/hung" ports
My pick? Our choices are always biased I'm sure but I like the Patton units. Rock solid day in and day out performance. Patton support has also been stellar.