Anyway to improve call quality when using the Microcell?

Call quality is usually an ISP problem. VoIP requires a very clean line, much more so than just internet traffic.

I prefer to use port forwarding (all 4 ports) to a statically assigned IP address based on the MAC address of the MicroCell over DMZ. That provides much more stability if you are prone to power outages or have a lot of devices on your network.

Below are some basic questions that we ask users who are having issues. It sort of sets a baseline for us to troubleshoot from:

MicroCell™ TroubleShooting Questions:

1. Have you read the Tech Guide first? 3G MicroCell Technical Guide by Otto Pylot
2. Do you have an active postpaid AT&T mobile account?
3. Is your MicroCell white or black?
4. Who is your ISP and is your service ADSL, cable, wireless or satellite?
5. What are your suscribed download and upload speeds as stated by your ISP?
6. Have you tested your internet speeds ( http://www.speedtest.net/)? Please run the test and post your latency, download and upload speeds.
7. Have you tested your connection for VoIP quality ( http://www.voipqualitytest.com/)? Please run the test and post the results that are listed under the "Advanced" tab.
8. Are you using the basic connection (modem -> router -> MicroCell) or the alternate connection (modem -> MicroCell -> router)? The alternate connection is not possible with the black (DPH-154) MicroCell.
9. Are all of the cables firmly in place?
10. Do you have a combined modem/router (gateway) or a separate modem and router? What are the makes and model numbers for your equipment?
11. Have you met the minimum requirements for router settings as outlined in the Tech Guide?
12. What other equipment (access points, switches, computers, WiFi components, gaming consoles, etc.) do you have connected to your network?
13. What does the light pattern look like on the MicroCell (power, ethernet, GPS, and 3G)? Are they all a solid green or is any of them blinking green or red, and if so, which one?
14. Have you done a hard reset of the MicroCell? See the Tech Guide for instructions.
15. Have you deactivated and reactivated your Mcell using AT&T's MicroCell website?
16. Does the ac adapter feel warmer than the top of the MicroCell where the vents are?

Yay!  Otto found his question list!

I was hoping to sneak this one by you without comment

1) Just now 🙂

2) Yep

3) White ( Not sure if Black provides any improvements over white - newer always better they say ) 

4) FIOS

5) 75 mbs / 75 mbs but usually ~85 mbs / 85 mbs

6) Yep - 83.75mbs / 91 mbs / 8ms

7)  Test results ( sort of annoying since I can't copy text ) 

VoIP stats...

Jitter:  you -> server: 0.4ms

Jitter:  server -> you: 3.5ms

Packet loss:  you -> server: 0.0 %

Packet loss:  server -> you: 0.0 %

Packet discards: 0%

Packets out of order: 0%

Estimated MOS Score: 1.2

😎 basic connection

9) All cables firmly in place

10) Asus RT66U connected directly to FIOS Ont.  Not using provided modem / router

11) Yep

12) PS4, HD HomeRun Prime, 3 PCs, Laptop, 2 Switches ( Microcell connected through one of them ), TV, Receiver, Cell Phone, Tablet, Philips Hue, Printer

13) Green

14) Yep, only way I could get the device to connect to anything

15) Yep, had to when trying to set it up again after not using the device for a year

16) Same

From the min requirements...

1) Don't see an option for Block Fragmented - Disable / Enable in router config

2) I know you said better not to use DMZ but I don't have any issues with outages.  I do have a lot of devices on the networ but I gave the device a static IP as well.

Otherwise good

Try to connect the MicroCell without using a switch. There could be something in that part of your setup that is now messing with the secure VPN to AT&T.

Is that the only option I have?  I can try to move it but it'll then obscured from the window.  I do remember that I had similar issues in the past

Any chance the newer model would be any better?

If you have a white MicroCell, you can connect an external antenna (a thin cable with a small round end for the window) so you can move the MicroCell away from a window.

As far as I can tell the performance of the new black model (DPH-154) is the same as the white models (DPH-151, DPH-153). I have the new model as well as both of the older models and performance was the same as far as I could tell.

Ok how close can it be to a router?  I vaguely remember reading something that said the microcell should be a distance away from my router?  If so, this thing is getting a bit inconvenient in terms of positioning 🙂

I believe the instructions indicate the MicroCell should be at least 2' away from a router.