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.

hi guys,
i got 1 cisco ip phone.
and i have nbn fibre to premises connection at my home. 50/25 mbps

how do i make my ip phone work and make national/international calls ??? is it possible ? or should i talk about some voice service or pbx system to my isp provider ?
Skype for business 2019 Yealink T58A | Trusted Certificate
I need assistance with phones we recently purchased, all T58A handsets with Skype for business firmware.
I have tried all 3 latest available firmware and stuck with this version as it offered a simpler login screen for users.
Phones register correctly for as long as the trusted certificate is not present.
Periodically the handsets will populate with a CA certificate on line 1 even though everything is set to disabled below and then the users are unable to sign into the phones.


What is causing the phones to download the internal root domain CA certificate?
I have an NEC Univerge 8100 phone system which has just changed over to VOIP from ISDN via a SIP gateway.  The system is operational now however when dialling out, the phone system is not sending the handset caller ID and the receiving handset dispalys "No Caller ID".  I have quizzed my new carrier on this and they have advised that the phone system is only sending the phone number, but should be sending the area code as well.  See my response from the VOIP support.  

Hey Daniel,

Looking at the call logs i can see your phone system is sending only an 8 digit number without the area code.
this will need to be altered to send the full 10 digit number.

this is an example of what we are seeing

From: <sip:93050561@Metrofreight>;tag=fb1ca9b91a

Is there some way I can set the phone system to send the area code as well?  In example above, it should send 0393050561

The VOIP carrier wont take responsibility for the NEC system and unlikely my previous carrier will want to assist.  

I have admin access to the web interface.  

Thanks in advance, Dan.
Samsung Galaxy S7 Active AT&T Firmware Downgrade

Hi there!
I bought 2 of these Samsung Galaxy S7 Active AT&T branded phones off ebay USA and got 'em delivered to Australia. Both of these phones were working perfecty alright with the old firmware installed (I'm reasonably sure the firmware was Android 7 Nougat), until I forced the new firmware update by manually updating the firmware to Android 8 via Odin.

We have got 3 major telcos and  numerous MVNO's(Mobile Virtual Network Operators) in Australia and both of these above-mentioned phones were working with all 3 major telcos and all of their MVNO's before I forced the firmware upgrade via Odin. Now, out of these 3 network operators Vodafone and its MVNO's sim cards has stopped working. Both phones working perfectly fine with other 2 network sim cards. I believe this has got something to do with the operating system upgrade as both of these phones having difficulty making/receiving calls on Vodafone network (I'm able to send/receive messages sometimes with long delays, though ). The new firmware must have disabled few of the frequencies/Network bands. The following link might help that has got the operating frequencies of these 3 networks

I am attaching the current software information and I want to downgrade the operating system(Firmware ) back to Android Nougat. I'm not worried about …
I am building the system and I am not sure sure in my architecture of the future system: The system enables people call to companies and organizations though web browser using WEB-RTC. Use-cases are following:

FROM browser to HOME PHONE
FROM browser to mobile phone number
FROM browser to browser
FROM browser to existing corporate call-center (IP)


Since all calls are recorded, there are different options how calls might be implemented: peer to peer, through media server. Also, there might be more than 1 million concurrent calls. System parts should be free/open source. In my understanding, system design is following(attached). However, i am not sure in this. Please, help to build right architecture.

Transitioning from traditional cellular service to pre-paid.

In an effort to dramatically reduce my ATT cellular phone bill which now reaches over $100 for one person in Waco, TX, I have contacted a local cell phone shop to try and determine if there is a prepaid option that could be as good on coverage and hotspot, but without the high cost and allow me to port my existing number. What the store told me was that Verizon had the best coverage but that even an unlocked device would have problems on that network. They said that the service through h2o would be an easy transition since they use ATT towers and would, therefore, work well with my existing Android ATT Galaxy Note 8.

I don't know if any of what they said is true, but I have included the details below in hopes that someone can shed some light on this and help me to make make the best choice that I can today.

Below are the access point names for h2o vs ATT.

Name: h2o internet
mmsc: (same as ATT)
Multimedia proxy: (same as ATT)
Multimedia proxy port: 80 (same as ATT)
MCC: 310 (same as ATT)
MNC: 410 (same as ATT)
APN type: default, mms, supl (ATT added fota)
APN protocal: iPv4 (ATT added iPv6)
APN roaming protocal: iPv4 (ATT added iPv6)

We have Alcatel Lucent Omni PCX office  when extension 221 is dialled  and if no one picks up, the call gets forwarded to another extension 283

I have admin access to the  portal  and not sure where the setting needs changed  and any help would be great.

VOIP calls suffering from silent patches.

We had BT Cloud Voice put in around 6 months back and have suffered with issues since it was put in. We put this down to our FTTC lines, however we have now had a Virgin Leased Line installed (100mb/1gb).

We currently have around 90 computers and 90 phones. These are run through Netgear GS752TPv2 switches and to a Draytek 2926 router.

Looking on the router, the syslog is showing quite a lot of errors similar to the one below:

 [VoIP_QoS] VoIP RTP[45348] Rx Loss detected: 16/115 ...

There is also a few errors as below:
 [VoIP_QoS] VoIP RTP[45344] latency detected...220.

I'm assuming the first error is the receive packet loss (of around 15% in the case above) which could be causing the silent patches.

As well as this, I've setup a ping to the router from two different computers that are in different switches. They are both getting timeouts at the same time, one or twice a minute (sometimes there is a longer gap, sometimes there will be 2 within 10 seconds).

Any ideas where to start looking to try and resolve this issue?

Thanks, Shane
I have Asterisk version Sometimes my recordings have the audio of the agent and the audio of the client desyncronized. I want to know how could this be resolved.

I tried put jitterbuffer in sip.conf, and I changed to

Best Regards.
Recently I have migrated the 3cx on-premises to Cloud and all Ext. are connected through SBC. All inbound and outbound calls are working fine except the voicemail....I am not getting any voicemail after migration and in log I got Main line SBC:Unavailable  .......Internal voicemail are working fine.
Getting "SMTP - unexpected data received. An unexpected end of message response was received.|" every couple of minutes, just started happening a couple of days ago. We haven't changed the internal SMTP server or upgraded our IP500v2's firmware.....stumped!
My current setup is this- I use a Watchguard firewall.
Interface 0 is external.
Interface 1 is trusted-
Interface 2 is trusted-
There is a VPN to another office that is

Our phone system is
If I plug a phone into the .2 network the phone will connect up without an issue.
If I plug a phone into the .3 network the phone will NOT connect up.

I assume there needs to be a policy in place to get the two to talk. I am unsure of what the policy needs to be.
hi - its a general question trying to understand how phones/phonesystems works .

got a client who uses nec phone systems SV9100 and nec phones.

connections are made like,:
phones are connected with telephone cables and going to patch panels
from patchpanels - using ethernet cable connecting to another patchpanels which has extension numbers.
extension numbers are connected back to phone systemsSV9100 in digital station interface and single line interface . (black cables in pic)
from phone system SV9100- a voip port is connected to lan switch (grey cable in pic)
and got another device "one access"  it has a ethernet cable connecting to lan switch.

i knew am confusing. but just need general idea- what is digital station interface and single line interface in sV9100 and what one device device does in the network ???
I can remote desktop using the Microsoft RDP app on android phone

I can also remote desk top on my laptop with WiFi

However when I try and tether my laptop to phone I cannot remote desktop to any server (10 different servers in different data centres)

I've tried turning off win 10 firewall, same.issue

Any ideas?
Hello, I've a Mitel PBX  for our Main office (200 users) and I would like to see if there is any low end PBX controller (15 users) that can be considered  for a branch office to handle internal call and route only the outgoing calls via Main PABX.
Hi I'm trying to setup a user on Avaya IP Office 6.2 to send voice mail to email.  The emails work for other users, but this is a user that is taking over an existing extension, so I need to modify (I think) the existing extensions voice mail to email.

Thanks all
We have Grandstream GXP2170s at our work and they're connected to a single 3CX PBX system.

Our company actually has 3 sub-companies, and we're planning on a multi tenant PBX setup in order to segment the various entities.

However, some of the executives have daily operations on all 3 of the companies, and need to connect to the PBXs and SIPs/Trunks of all 3 companies.

Will this be possible to do to have the Grandstream GXP2170s connect to 3 different PBXs and SIP accounts within the same headset?

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?
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,

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?



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.