voip pabx technical faq

Can I reduce the PABX's reliance on DNS in case my DNS server dies?

What firewall ports do I need to configure?

Can I use a SIP phone directly over the Internet back to my PABX?

web interface

The web interface won't log me in.

configuring

How to configure Siemens Gigaset C460IP or C450IP

How to configure Siemens Gigaset S450IP

How to configure Polycom IP Phones

How to configure X-Lite 2.0 for Linux

How to configure Linksys ATA devices

How to configure Linksys ATA devices to support "Hook Flash" (The "R" button for trnasferring calls)

How to configure Xorcom Astribank 8

phones

The manual says our phone can be auto provisioned, but it is not working.

I cannot log-on to the web interface of my phone. What is the username and password?

I hear pops hisses and/or pauses when talking on my phone.

Phones periodically report 'NR' or 'No Service' / All my phones have stopped working

When I talk on my phone/headset, people say I sound very quiet

I use a headset on my phone, and can hear lots of humming or buzzing.

What version of firmware should I have on my phone?

I cannot transfer calls / Transferred calls are dropped / Transferred calls don't ring for long enough to be answered.

I do not get caller ID on inbound calls.

I do not get the correct caller ID on outbound calls.

Can I use my Nokia E61 phone as a SIP Phone on your PABX?

fax

We are using a soft-fax, and some people can never get a fax to us.

We are using a FAX machine on an ATA, and it is unreliable. What can we do?

I've heard about using T.38 for faxes on digital systems. What is it, and can it help?

Is there an email-to-fax facility on the PABX?

inbound calls

Inbound calls do not work.

outbound calls

I cannot dial 100 to get the operator

I want to use a VoIP channel by default. How?

How can I calculate correct charges for calls made over the IPCortex VoIP service?

email

Email notifications of voicemail or faxes is not working

voicemail

I dial 8500 to pickup voicemail but nothing happens