Strange problem with Siemens C450ip
 

I have this strange problem that calling out with my C450ip doesn't seem to work. When I dial my own 6-number voxalot number it says i'm not online and can leave myself a voicemail.
If others phone me (through a registered provider) the phone does ring.

With about every other number I dial I get a 403 SIP-code on my C450ip's display and a busy tone.

When I call however with XLite logged on to the same account I am able to call out.

Can anyone help me with this?

I use the following settings:

Authentication Name: 340742
Authentication password: my voxalot password
Username: 340742
Domain: voxalot.com
Display name: My name
Proxy server address: voxalot.com
Proxy server port: 5060
Registrar server: eu.voxalot.com
Registrar server port: 5060
Listen ports SIP: 5062, RTP: 5004 (these are forwarded to my C450IP)
Use random ports: No
STUN enabled: No
NAT refresh time: 20sec
Outbound proxy mode: Never

I also tried with eu.voxalot.com as Proxy server address, with the same result.

Setting: Predial area code for local calls through VoIP: No

Hope someone can help me or explain me why I get this behavior.

Some update....

Seems like a problem with Budgetphone and calling out.
Just tried a number calling out through voipbuster which did work.

Someone else also having problems calling out with budgetphone through Voxalot? I believe this worked before....

Problem solved, for some reason the from domain field had a faulty value, I can now phone again.