VoipStunt on Linux (Ekiga)

[^rooker]

This HowTo explains how to setup Ekiga (default softphone client on Ubuntu) for use with an existing VoIPStunt account.

1) First add a new account (Edit > Accounts):

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Account Name: Voip Stunt
Registrar: sip.voipstunt.com
User: yourusername
Password: yourpassword

More Options:
Authentication Login: yourusername
Realm/Domain: voipstunt.com
Registration Timeout: 3600

2) According to the VoIPStunt homepage, you can use their STUN server (optional?)
Ekiga Preferences > Network:

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Net Traversal Method: STUN
STUN server: stun.voipstunt.com

That's it.
The syntax for placing PC-to-phone calls is:

sip:+4311223344@sip.voipstunt.com

Edit: I have now tried it without the port number (:5060) and it works.

[^rooker]

[PROBLEM]
Recently, I ran into a strange problem when using Ekiga with VoipStunt:
No matter which call I tried to make, I heard a ringing tone - but the called side didn't even ring.

After a few "rings" Ekiga disconnected me and left me with an errormessage:
"Anruf aufgrund eines Fehlers abgebrochen"
(Call cancelled due to an error)


[SOLUTION]
I had to disable the STUN server and use nothing instead. Strange. They (VoipStunt) have probably changed something on their side.


[BACKGROUND]
I used Wireshark to take a look at the SIP packets (WireShark is grrrrreat - just a few clicks and it digs out SIP calls in a stack of packets - lovely!) - and I saw a strange sequence:

Ekiga: INVITE > Voipstunt
Ekiga: CANCEL > Voipstunt
Voipstunt: 400 Bad request > Ekiga

???
Why is there a cancel after an invite coming from my side? However. Disabling STUN fixed the problem, although I must admit that I didn't really understand the reason.