How do I get Lumicall?

Use F-Droid, look for the `Google Play' icon (formerly Android Market) in your phone, or see the download instructions.

How can a SIP service provider support the rapid account setup?

Many SIP phones require users to set many different options to configure an account. Lumicall users can configure their account by entering only the SIP address and password.

For this to work, Lumicall expects the following:

• There is a TURN server as described in RTC Quick Start Guide.
• The SIP server and TURN server have NAPTR and SRV records in DNS as described in the RTC Quick Start Guide.
• The same password is accepted by both the SIP and TURN servers.
• The servers accept the full SIP address, not just the username part, as the authentication username. The server may need to have the HA1b hash of the username and password to operate this way.

How can I test if Lumicall is really working?

Please try dialing the SIP address test@sip5060.net on your phone. The easiest way to do this is to click the link on your phone, or to open the main Lumicall dailer screen, and put test@sip5060.net into the box.

Which encryption should I use: ZRTP or SRTP?

ZRTP is the default mode of encryption. ZRTP mode is dynamic: if you call someone without ZRTP in their phone, the call will still proceed, but it will not be encrypted, and you will be alerted by a red warning on the screen.

One particular benefit of ZRTP is that it provides end-to-end encryption: if both you and the person you call see the same code words on your screen, you can be certain that the call is not decrypted and re-encrypted in the Lumicall server.

SRTP is a static mode of encryption. It is appropriate for closed networks where all users have SRTP, and where you have significant trust in the servers on the network. A typical example is a privately managed SIP proxy server that is administered by someone you know and trust within your company.

What is the ZRTP Short Authentication String (SaS) - the random code words that appear in a green box?

The ZRTP encryption scheme uses a Diffie Hellman key agreement algorithm to generate an obscure and random password for encrypting the call. The Diffie Hellman algorithm uses a special mathematical technique to generate the same password on both phones (caller and callee), without having to send the password from one phone to the other. The code words that appear on your phone are a `short authentication string', they are a by-product of the mathematical process. If you and the person you are speaking to both see the same code words, and if you are confident that the person's voice sounds authentic when you read the code words to each other, then you can be confident that the call is encrypted end-to-end.

Which phones are supported?

Android phones, as they now have greater market share than all the other smartphones combined (in other words, n(Android) > n(Blackberry + iPhone + Nokia))

I have the new Samsung Galaxy Tab 10.1, it can't make normal phone calls - can I make phone calls with Lumicall?

Yes, the Galaxy Tab can make phone calls over the internet using Lumicall. The speakerphone is enabled by default on this device, and the quality is quite good.

What protocol does it use?

SIP

What additional features are present?

TLS, ICE (RFC 5245) for NAT traversal, DNS SRV, ENUM, ZRTP, SRTP

Does it work with Kamailio?

Yes, press the menu button and enter your Kamailio server details as a new SIP Identity

Does it work with repro from reSIProcate?

Yes, press the menu button and enter your repro server details as a new SIP Identity

Does it work with FreeSWITCH?

Yes, press the menu button and enter your FreeSWITCH server details as a new SIP Identity

Does it work with Asterisk?

Yes, press the menu button and enter your Asterisk server details as a new SIP Identity

Does it work with DDI numbers from any VoIP provider?

If the VoIP provider supports SIP, TLS and ICE, it should work

How can I make reliable VoIP calls?

Read the chapter Optimizing Connectivity in the Real-Time Communications Quick Start Guide.