Can't call any German Toll Free numbers through Voxalot
 

Hello,

I'm facing a problem dialling German toll free numbers (49800xxxxxxx) when using ENUM lookup in a Voxalot dialling rule. All toll free numbers resolve to sip:49800\1@sip.pbx-network.de

The error message I get is
407: Proxy Authentication required

My first thought was that pbx-network.de requires authentication and provides the termination of these calls only to their customers, so I posted to the e164.org forum about this issue.

German Toll-Free Numbers: ENUM resolves to sip:49800\1@sip.pbx-network.de

evilbunny, the mod of this forum, whom I also sent a logfile showing this error message pointed out that the root cause must be within Voxalot.

When calling the toll free number directly (sip:49800xxxxxxx@sip.pbx-network.de) the call wents through properly.

Now my question to the Voxalot Team:
Can you find out the root cause for this issue?

Here is the trace:
Thanks for your efforts,
cheers, gambrinus.

The authentication digest is "voxalot.com" which means that Voxalot is challenging your end point for credentials.

If you look at the "From" address it is a voxalot.com URI

My first question is whether or not your ATA / Device is authenticating with the Voxalot server properly?

Hi Martin,

thanks for your quick response. I'll quickly explain how to reproduce the issue. This is my setup:

1. Setup an ATA to register with Voxalot.
2. Create a dial plan:
   Pattern: _0800.
   ENUM Lookup: 49${EXTEN:1}
3. Test dial plan with any 0800xxxxxxx number (this is how you would dial the number if based in Germany). You will get:
   A call to:08001234567 will get forwarded to sip:498001234567@sip.pbx-network.de
   Also see: ENUM lookup result: 498001234567
4. Dial 08001234567 using your ATA. You will get a fast busy tone and a 407 (Proxy authentication required) in the log.

And yes, the ATA is properly registering with Voxalot...

Any ideas? I have cancelled my fixed line, it will be switched off on Friday... If needed for testing: I own such a German toll-free number, but it is already registered with e164.org and the SIP-Route points to my Voxalot account, so it is currently the only number that works for me... :-(

Thanks for your efforts,
gambrinus

Any ideas? :(

Just tried this scenario using x-lite and after dialing:

08001234567

I got a German announcement repeated twice followed by one in english:

"The number you have called is not in service. Please check the number and try again"

Very interesting. From the same ATA does dialing *393613 get you to the FWD echo test OK?

Does 18005551212 get you to the TellMe directory assistance?
.

Hi Martin,

Yes.

Yes, although I have to dial 0018005551212 (since I have setup Voxalot Dial Plans according to German numbering plan; 00 is the access code for international calls).

When testing this number at the Dial Plan Test I get: A call to:0018005551212 will get forwarded to sip:18005551212@tf.voipmich.com

So ENUM generally works for me and I use it very often since I've registered all my family and friends numbers with e164.org

Just with German Toll Free numbers I still get the 407 Proxy authentication required error message, both using softphones (Gizmo, PhonerLite, X-Pro) and my ATA. When registered to my Voxalot account even when dialling the SIP URI (sip:498003301000@sip.pbx-network.de) I get the 407 message!

I'm really running out of ideas...

Maybe it makes sense to have a look at the server log files to see what's happening.

Thanks a lot for your assistance,

gambrinus

Looks like we might have to. This level of debugging however requires live interactive debugging as we don't log all the SIP traffic in production.

I will send you a PM with some additional details.

Thanks.
.

For the benefit of everyone:
With joint efforts (thanks to Martin from Voxalot and Lorenz from PBX-network!) we finally found the reason for this issue (affecting all proxy services, not Voxalot only):

If a PBX-network customer registers his account with a proxy service all other users of this service will be challenged for authentification (407), which of course will fail.

PBX-network will workaround this issue in the next few weeks. Will keep you updated.

Regards,
gambrinus

I know you have a solution coming but I had a similar problem with another freecall provider, have you tried setting up PBX as a VSP in your voxalot account. Put sip.pbx-network.de in as the host name and anything for the username/password as they should not matter.

Now set up a dial plan to route the calls to this VSP. e.g route to 498001234567 and use PBX VSP as you set up earlier. Turn off enum on the dial plan. Not promising it will work but worth a try

Well I have a working route for 49800 but others might not. That's why I try to solve the problem at its root. For everyone.

In case other have the same issue, are you confirming that the method I posted worked?

I am unable to test it as I can't find an 0800 german number to test

EDIT: It is ok, I just tested it myself and it doesn't work - I don't get the german women telling me that the number is wrong like I do when I dial from voipuser.org

PBX network has setup a dedicated server for the toll-free traffic (freecall.pbx-network.de) and the e164.org ENUM records for 49800 are now correctly resolving to it. I have tested and can confirm the issues have been solved by this measure.

My thanks goes to Martin from Voxalot and Lorenz from PBX-network.

Merry Christmas :-)

- gambrinus