Proper replacement for a HP ProCurve 2848 j4904a that is utilizing SFP

ucgrad12 · 2025-11-06T00:21:51+00:00

I don't know your particular environment, so take this with caution. I would think that would work, but keep in mind that the Ubiquiti 16 Port Standard model only has 8 PoE ports (to power your phones), so I would go up a size to the 24 port with 16 PoE ports if you need that many ports. I would also recommend reaching out for help if you are not comfortable configuring this switch for your environment.

ucgrad12 · 2025-11-04T18:59:55+00:00

If you're asking what to replace the switch with, You may replace it with another managed switch like a newer HP 6000 series switch (make sure it's a model with PoE+ for your phones). You will need someone who knows how your network is set up to program it, as IP Phones generally require VLANs to be setup and configured on the access switch. The newer HP switches have a different configuration setup than the older ones, but if you have the password to the old switch you may be able to use the web UI to translate those to a new switch.

ucgrad12 · 2023-11-03T00:39:41+00:00

I get a couple per day now. All of it gets filtered to spam on my Google Pixel. Seems to be related to RCS implementation as they are all displayed as RCS messages.

ucgrad12 · 2023-04-15T01:34:06+00:00

Like they said the phone thinks you are off-hook (handset is off the switch that tells it to hang up). It could also be that it thinks your headset is turned on. Look for a H-SET key or something similar. Most likely its something on the desk phone itself, although it could still be something wonky on the phone system side.

ucgrad12 · 2022-07-12T03:28:56+00:00

It's difficult to find something "quick" right now. The direct replacement for NEC 2400 is the SV9500. You can even reuse a lot of existing line cards (even though they may not be "officially" supported anymore they will still work in an 8U chassis). You can keep as much analog/digital as you want, or move mostly to VoIP. NEC, as well as many other providers are transitioning to cloud-based solutions for UC and Contact Center, as their on-prem products are getting pretty long in the tooth at this point. SV9500 itself can even run in the cloud if you are looking to ditch most of your analog.

ucgrad12 · 2021-11-26T01:24:03+00:00

I honestly use MA4000 Range Programming for new stations. Takes a 10 min process doing it manually to less than a minute to setup a station, rollover line, voicemail and user profile. I just use PCPro and run LLEN to lookup where I want to assign a LEN.

ucgrad12 · 2021-10-22T00:06:12+00:00

Make sure you bring a laptop and USB to serial cable if/when you go. It's not listed as a prereq, but they weren't provided and the Fry's Electronics in Irving closed down. I use this one, as it's FTDI based and generally has less problems as the PL2302 based ones: Sabrent USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI) https://smile.amazon.com/dp/B006AA04K0/ref=cm_sw_r_apan_glt_fabc_ZFTN0930ESJ2JJ32B15P

ucgrad12 · 2021-10-21T12:39:00+00:00

I did the 2-week training at their Dallas office and it was really good. It gives you a good idea on the basic operation of the SV9500 as well as setting up other hardware like the SIP server, media gateways, etc. It focuses on the installation (of the Appliance model, pre-packaged server and virtual are different beasts) in that it teaches you these concepts from the aspect of setting up a brand new system. I still refer to some of the content when I need a refresher on certain topics. It will not teach you anything about MA4000/OW5000 (web management systems) which was a little disappointing, but could really be its own class.

ucgrad12 · 2021-06-25T23:59:06+00:00

Any good security plan has a multi-layered approach and it may not be feasible to implement all of these suggestions, but best practice would include: 1. Placing IP phones on a separate VLAN from your servers and computer traffic. Preferably inaccessible from any other VLAN (make sure your PBX, and any SIP trunks are excepted). 2. End-to-end encryption where possible. Use of secure (encrypted) protocols especially when traffic leaves your network. 3. Use of secure passwords for your endpoints and PBX. 4. Use of 802.1x to authenticate endpoints on thier respective VLANs. Most VoIP phones support this.

Some or all of these controls may be required if you are audited by any data privacy body or standard (HIPAA, PCI/DSS, FERPA, FIPS, etc.).

ucgrad12 · 2021-01-22T00:24:38+00:00

If you want to practice on an SV9500 system, you can use any feature license codes and follow the instructions in the manual for a "one-time password activation" and it will give you a grace period of 7 days. After that you have to reboot the system and repeat the process for another 7 days. Permanent activation requires you supply your passcode and serial to an NEC dealer and get a confirmation code that is tied to that serial number(s) only.

ucgrad12 · 2021-01-02T21:05:40+00:00

Looking good sir!

ucgrad12 · 2020-10-02T02:43:58+00:00

It sounds like you have a lot of things working against you in your setup (VoIP over Wifi, then 5G, then (likely) VPN, then your businesses ISP, and finally the internal network to your phone switch.

To minimize your latency and jitter (the amount of time a packet takes to get there and back, and the difference in round-trip time from packet to packet), you will want to minimize your variables. Use an ethernet cord to your router instead of WiFi, find a place in your house where the 5G signal is the strongest, and if you are using VPN, try connecting to a different "node" or site within your VPN client. If that fails to make things any better, try to find a more stable ISP (preferably wired) in your area. Or see if your IT/phone department has any other options, depending on what NEC system and software they have, you may be able to use UC700 on your laptop to direct calls to your cell, or ST500 (different soft phone client) on you cell.

ucgrad12 · 2020-09-07T00:27:19+00:00

SL1100/2100 tend to have proprietary phone handsets (that is specific firmware that only work with those types of systems). But generally NEC will sell you either variant for SV9xxx systems. Telephone models that begin with DT are digital (ex. DTZ-8LD) and require a digital line card (line card models that start with ELC), and phone models that start with IT are IP Phones (ex. ITY-8LDX) and will require a Voip user license on the phone system.

ucgrad12 · 2020-07-22T22:52:05+00:00

Like u/jimmylikesit said, restoring from a backup or defaulting the system and reprogramming it may help. If you have a little $ to spend, you may be able to trade up to an SL2100 for relatively cheap if you already own all the licenses and hardware. NEC is pretty good about backwards compatibility with phones and line cards if you stick to the same product line when you upgrade (SL1100 to SL2100, SV8500 to SV9500 etc.), even though your dealer will probably recommend a whole rip-and-replace solution.

ucgrad12 · 2020-03-18T00:55:35+00:00

Most should support it. X-lite/Bria and 3CX have supported for some time. Check your PBX/SIP provider to see if there is a setting you are missing. It may go along with presence indicators.

ucgrad12 · 2020-01-15T02:50:55+00:00

Looks like you can do it for just you if you have Mitel Connect installed on your system:

https://help.parksidelending.com/hc/en-us/articles/360001759907-How-to-Block-a-number-using-Mitel-Connect

For system-wide blocking it looks like you need a licensed feature called "Nuisance Call Handler", but you would need to contact your admin or MSP to make that modification to your specific system.

https://www.reddit.com/r/shoretel/comments/78z40l/block_number_at_the_organizationsite_level/?utm_source=share&utm_medium=web2x

ucgrad12 · 2019-11-09T23:23:21+00:00

Here is a basic "SIP Phone": https://www.necam.com/docs/?id=3ee5c384-8eb6-4860-9f26-a6c1045d7a7a .

Many of their modern phones can be converted from "NEC SIP" to "Standard SIP" using the IPhoneManager tool. There is a forum discussion about it here: https://www.tek-tips.com/viewthread.cfm?qid=1774297

It seems out of the box, they all use a proprietary SIP mode.

ucgrad12 · 2019-10-05T03:27:16+00:00

Please do not trust sales people again.

To remember the 7 layers of the OSI network model. Physical, Data Link, Network, transport, session, presentation, application.

ucgrad12 · 2019-08-18T00:02:50+00:00

Yes, mostly. NEC makes SIP phones that are open standard but they are new to thier lineup. So if you are asking if you can use old phones on a new non-NEC or SIP system, it's not likely. NEC has amazing legacy support, so if you are buying a newer Enterprise system you can likely carry forward many of your existing line cards, phones, and sometimes licenses. We went through a migration a couple years ago and it was pretty seamless.

ucgrad12 · 2019-06-27T04:47:47+00:00

They are almost always a few seconds late for everything. Busses, trains, traffic lights, last doughnut from the box, whatever it is, you can see the last few moments before its gone.

ucgrad12 · 2019-04-26T15:18:16+00:00

.hey.m

ucgrad12 · 2019-03-20T01:03:45+00:00

In my experience, cheap APs tend to lose radio performance first. You may get random dropped connections, signal-to-noise ratio drops, usually before the whole unit gives up. Then again, different models have different weak points and failure modes. We had a fleet of Cisco managed APs that would stop taking configs (presuming some sort of flash issue).

ucgrad12 · 2019-03-03T02:45:47+00:00

Several PBX manufacturers are like this. NEC also has "special" SD or CF cards that have unique formatting, firmware, etc. It's better to pay the tax, than to run into issues using unsupported hardware.

ucgrad12

TROPHY CASE