Audiocodes MP-1xx Initial IP configuration

I recently experienced difficulties with the initial ip configuration on an MP-118 FXO.

After I had configured the IP address on the quick install page, the only available button to push is “reset”, no “save”, “apply” or “submit” buttons are available. In my simple mind this meant that I had to push reset. Did not turn out to be a good idea. I could not make contact with the mediagateway on the new IP or the old. I tried keeping the “reset” button on the back pressed for more than 6 seconds, hoping it would get factory settings, thinking I had messed up the IP-address when I punched it in. But it made no difference. Noticed in that in the manual it said I could set the IP via bootp, so I downloaded a dhcpserver that supported bootp, and like magic I could contact the mediagateway again.

I tried setting the IP again, but the same thing happened when i moved the gateway to its final position in the rack. I then set the IP once more with bootp, and looked through the configuration settings. I discovered the “burn to flash” feature, and thought I had found my mistake. But no. Same thing again.

After yet another round of bootp IP setting, I found the IP settings under the “Advanced Configuration” tab, and this page had a “submit” button. And lo-and-behold! this time it worked.

Probably a bug in the firmware that the IP won’t stick when you configure it at the “Quick configuration” page, but at least now I know about it.

Other than that, the Audiocodes gateway seems ideal for OCS voip implementation in SMB’s!

PS: I wrote this purely on my recollection of it, so the button names and configuration page names may not be accurate!

Cisco UC 520 PoE

The Cisco UC 520 has 8 PoE ports out of which you can draw 88 watts of power. This means that with each Cisco IP phone drawing 12 watts of power, you can only have 7 IP phones (= 84 watts) on the 520.

If you don’t know this it can be quite hard to troubleshoot, because the phone doesn’t get enough power to create a link, so it looks as if the port itself is dead.

If you are planning to implement the UC 520 in an environment with exactly 8 phones, remember to add the companion switch to the solution so that you have enough power to support all phones.


H.450 is an umbrella protocol to support supplementary services in H.323.

It is subdivided into

  • H.450.1 Generic functional protocol for the support of supplementary services in H.323.
  • H.450.2 Call Transfer supplementary service for H.323.
  • H.450.3 Call diversion supplementary service for H.323.
  • H.450.4 Call Hold supplementary service.
  • H.450.5 Call Park supplementary service.
  • H.450.6 Call Waiting supplementary service.
  • H.450.7 Message Waiting Indication supplementary service.
  • H.450.8 Calling Party Name Presentation supplementary service.
  • H.450.9 Completion of Calls to Busy Subscribers supplementary service.
  • H.450.10 Call Offer supplementary service.
  • H.450.11 Call Intrusion supplementary service.
  • H.450.12 ANF-CMN supplementary service.

In Cisco CME it is important to remember to enable H.450.12 in addition to the default subprotocols for redirection of calls to work.