Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.

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Hi there,

I'm looking for a solution to make a 3 way voice call between 3 sites and hang 5 lines off each of those sites.

Two of the sites have 1 PSTN line only and one site has two PSTN lines, and each location would like 5 POTS/physical handsets to be able to use at any given time (not cell phones).

Site A - 1 PSTN
Site B - 1 PSTN
Site C - 2 PSTN

Each location also has IP connectivity between the 3 sites but it is setup like a WAN so is a closed network and there is no internet breakout. Therefore no hosted solutions can be used.

So far this says simple PaBX either traditional or IP based.

Each site can call out which is fine but there maybe times that each of the sites need to be on the same call together and have more than one handset from each site join a call.

The bit that I'm not clear on is if each of the sites want to have a 3 way call between them and have each of the 5 local lines connect into the same call. Would the easiest way to do this be simply have a PaBX system on each of the 3 sites and have two off the sites (A and B) with 1 PaBx dial in to the site with the 2 PSTN sites (Site C). Then have the PaBX on site C merge the calls?

This seems a little clunky, is there a better way to do this? Is there an VOIP/SIP solution that would work better?

Trying to keep this uncomplicated and keep margin for error to a minimum so simple PaBX solution was my initial thought. If this is the best solution, does any one have any …
Expert Spotlight: Joe Anderson (DatabaseMX)
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Expert Spotlight: Joe Anderson (DatabaseMX)

We’ve posted a new Expert Spotlight!  Joe Anderson (DatabaseMX) has been on Experts Exchange since 2006. Learn more about this database architect, guitar aficionado, and Microsoft MVP.


I have a Samsung Galaxy S9 phone.

On this phone is an app that needs to be open in order to get the most out of the app.

Is there a way to have certain apps on this phone open once the phone is powered on and started up?

NEC sv8100 UC desktop Issue where I cannot untick Hide BLF button for some extensions, is there a setting on Webpro that I need to change for these extensions?

I am wondering if anyone knows what cordless units are compatible with the NEC SV8100 phone system.

I need to replace a couple of cordless handsets but cannot find any, even used. There are plenty of corded DTL-12D-1 BK TEL DT300 units available but I require cordless. Ebay has some base sets but no accompanying hand unit. I'd like to get a couple of more years out of the system which is still working fine.

Have been looking at Google Fi service and interested in others experience. Particularly how well it works outside of the US, since that's where I'll be using it most of the time.

I'm not looking for other carrier suggestions though.

Sometimes SIP channels get "stuck" in Asterisk and cannot be hung up without  restarting Asterisk. FreePBX shows the channels in the "Active Channels"  list under the Asterisk Info "Channels" menu but the "Active Channel" count at the bottom of the list is less than the number of channels in the list.  When trying to hangup one of the "stuck" channels using the channel request hangup <channel> command from FreePBX Asterisk CLI we get a 'channel not found' error. Asterisk version 13.9.1, FreePBX
I wish to setup On-Premise IP-PBX Business on my local server using proxmox vm. While being able to sync with an on premise Crm like bitrix24

I was thinking of getting switchvox. Kindly advise.

Have the following Scenario and need your advice for the best technical solution to be used.

- We have customer who is working with Oil Shale
- Mine Dimension : 3 KM x 1.8 KM x 80 Meter Depth  
- Around 15 machines working in the mine
- Machines need to be connected to the internet to send data either WIFI or GSM.
- The Customer Offices has Internet connection (Microwave)
- Distance Between Offices and Mine is around 3 - 4 KM
- One the Mine Surface - There is GSM Data Coverage (Still weak) but as the machines go down it looses connection

Our Issue we need a internet coverage for the machines, what do you recommend ?

Thank You
We recently started noticing that a certain floor of a building on campus can only call 1 direction.  When either side tries to call the one side in the bottom of our building cannot hear anything that the other side is saying. This only happens to the 3905's on the first floor of a specific building. If you use a higher model phone on that floor it doesnt happen and if you bring a 3905 up a floor or anywhere else and it functions perfectly.  Strangely, this isn't consistent as some 3905 phones on that floor can call some phones in other areas of the building and there are no problems at all.  I am stumped.  Any suggestions would be appreciated!

Phone system is Cisco
Switches are Cisco 2960S-48fps-L models with IOS 15
Call Manager and Unity versions are 11.5.1
Phone affected on the first floor of the one building are Cisco 3905's

If any log files are needed I can provide those.
Hi All, I am attempting to configure an AAPT IP based trunk in 3CX via a dedicated TPG SIP service, and am struggling to get it working.

What I really am after is examples of working AAPT trunk configurations that I can compare my set up to.

If anyone out there could provide some examples of correct trunk configuration, I would be extremely grateful.

Wireshark shows OPTIONS messages successfully hitting the phone system from TPG SIP server, and 200 OKAY messages being sent to TPG SIP server.


 - 3CX on premise
 - Wireshark shows OPTIONS being received and 200 OKAY being sent to/from TPG SIP IP
 - Dual WAN connection with dedicated SIP service on WAN2
 - NAT on WAN2 to local IP of 3CX
 - Static routes are configured to route required SIP traffic in/out via either WAN1 or WAN2 depending on what port is required

Kind regards,

Learn Ruby Fundamentals
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Learn Ruby Fundamentals

This course will introduce you to Ruby, as well as teach you about classes, methods, variables, data structures, loops, enumerable methods, and finishing touches.

Hey guys,

I’ve recently started a new role and I’ve noticed that the guy before me has configured his guest WiFi to use the internal DNS for name resolution....traditionally, the approach I’ve always taken is to direct all guest access off the LAN and to use the DNS of our ISP.  Surely this is a security risk? The guys here say it was done to control/manipulate and secure DNS - but I’m not seeing their point.  Can anyone shed some light?

Im wanting to host simple PABX for multiple custmers and not sure which vendor to go for
we will host about 40 PABX's each with around 5 phones attached
support failover we will have instance in 2 separate DataCentres's for redundany/failover
needs to have single SIP trunk to host for all the calling voice channels
need to be low cost around 1$-2$ per extension and scalable as well
meed to be simple to provision and reliable
will be using yealink phones

any recommendation would be great
One of the Shoretel Server Services showing RED. ShorewareCDRMigration-UPG
Does anyone knows about this service? It seems that server working fine. Thank you!
Dear Experts, I have a question related to telephony service. We are using IP PBX Grandstream UCM6510 with SIP trunking from The Provider.

So as my understanding, for example if our number is +AA 710xxxxx; I create a conference room in UCM6510 at ext 8888; then when customers want to join a conference room with us, they will call to +AA 710xxxxx, press 8888. Am I right? (AA is my country code)

But the Boss now have some customers in USA, UK,... and he wants his customers will call to USA, UK numbers, (for example: +1xxxxxxxxx; +44yyyyyyyy) respectively instead of our number (+AA 710xxxxx)  to join our conference room.

Is this feasible? Can you please suggest the solution? Many thanks!
Dear Wizards, is there any tool for simulating Grandstream UCM6510?

just like in Network we have GNS3, EVE-NG, Packet tracer,,...Can you please suggest? Many thanks!

Line is not releasing after transfer the call form Avaya SIP extension which is registered with Alcatel PABX
In Skype for Business Server 2015, Is there a way to disable clients from retrieving location information from the LIS/Secondary LIS every time the client registers with the server? I want to prevent the client from performing a HELD request to get location information when it first registers to the server. Is this possible with the on-prem server?
Lately, our staff complain about receiving multiple spam calls daily from what appear to be 'spoofed' local numbers. It started about two weeks ago and it looks like somehow direct numbers of staff got in the hands of wrong people.

Is there something that can be done about this?

Thank you!
OWASP: Avoiding Hacker Tricks
LVL 13
OWASP: Avoiding Hacker Tricks

Learn to build secure applications from the mindset of the hacker and avoid being exploited.

Hi all, we need to have call recording for our VOIP system, does any know of a 3rd party vendor who offers this? Our current vendor and we are not switching anytime soon.
i am wondering if anyone has any experience in telephone  call accounting software.  i have a client who uses a piece of software called phonecontrol (
i am wondering if there are other options out there.  they want to be able to see call costs for extensions on their samsung phone system so they can on charge their tennants.  

the phone control version they have can no longer be activated after  we had to reinstall their windows OS.  and the software support has not been helpful.  so looking for alternatives.
help with setting up VLAN on a few switches for phone and data equipment.

i have a series of managed switches that are uplinked together.  I would like to set up a VLAN 100 for a dedicated router that is on port 48 of one switch. This router will listen to requests from phones that are plugged into any other random ports on the switch.  This switch is a ubiquiti unit that allows me to set port 48 to listen to vlan 100 traffic only.

The phones are set to 802.1Q with a vlan of 100.  there are other computers and servers on the switch that are on a 192.168.0.x subnet.  The server is handing out DHCP as well as the router on port 48.  The idea is to isolate the traffic for the phones to ONLY communicate with the DHCP server on port 48.  

Right now, this setting is working. However my question to you, is since the phones are all plugged into random ports 1-47 and set to vlan100  and these ports are set to listen to both default lan traffic as well as i simply congesting the switch with added default and vlan traffic vs setting the actual ports that the phones are plugged into to ONLY vlan 100?

Also, if i plug in another switch,, do i need to set the uplink from one switch to another switch with a vlan100 for them to comminicate or will they pass the phones traffic that is tagged 802.1Q VLAN 100 traffic to the other where the port 48 will ultimately listen and grab it? Thank you!
I am running FreePBX v13 and need to hangup all current calls from a set of extensions at a set time every day.  
Does anyone have a script or method that could perform this type of function??
I have a BCM 200 with 4 analog lines incoming.  I would like to use the BCM to call forward these 4 lines into a new phone system that I am trialing. Could someone please point me in the right direction as I am not familiar with configuring BCM's.

I am looking for an entreprise grade gsm modem compatible with kannel.
I need to send at  least 100 sms per minute.


Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.