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ER7406 - Telekom Germany SIP registrations randomly fail (401 Unauthorized)

ER7406 - Telekom Germany SIP registrations randomly fail (401 Unauthorized)

ER7406 - Telekom Germany SIP registrations randomly fail (401 Unauthorized)
ER7406 - Telekom Germany SIP registrations randomly fail (401 Unauthorized)
18 hours ago
Model: ER7406  
Hardware Version: V1
Firmware Version: 1.3.2

I am observing an issue with an ER7406 (v1.0, FW 1.3.2) related to SIP registrations of a telephone system and would appreciate your assistance.

The setup consists of an Auerswald COMtrexx PBX running firmware 2.6. Among other connections, four Telekom Germany SIP accounts (multi-device connections) are configured on the PBX.

After an unspecified period of time, individual SIP accounts lose their registration. The affected accounts do not follow any recognizable pattern and it is not always the same accounts that are affected. The PBX reports the following error message for the affected accounts:

Registration failed – Error description: 401: Unauthorized

 

Triggering a re-registration via the PBX interface has no effect. The registration can only be restored by disabling the affected account, saving the configuration, enabling the account again, and saving once more. After that, the account works normally for some time before the problem reappears.

In addition, a Peoplefone SIP trunk is configured on the same COMtrexx system. This trunk does not exhibit the described behavior and remains registered continuously. Based on my observations so far, the issue only affects the Telekom accounts.

 

The following points have already been verified:

• SIP ALG is disabled on the ER7406.
• The SIP credentials are correct.
• Different Telekom accounts are affected without any recognizable pattern.
• IPv6 is disabled on the PBX.
• The issue became noticeable after updating the COMtrexx firmware to version 2.6.

 

To further narrow down the source of the problem, I temporarily replaced the ER7406 with a FRITZ!Box 7590. Apart from the router, the entire environment remained unchanged (same internet connection, same PBX, same SIP accounts).

Since replacing the router, all registrations have remained stable for several days without any failures.

 

Therefore, I would like to ask whether you are aware of any known issues with the ER7406 related to:

• SIP registrations
• NAT / UDP session handling
• UDP timeouts
• Telekom Germany SIP services

 

Are there any known findings, diagnostic options, or settings that you would recommend checking?

I would be grateful for any advice or troubleshooting suggestions.

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#1
2 Reply
Re:ER7406 - Telekom Germany SIP registrations randomly fail (401 Unauthorized)
4 hours ago

Hi,  @SFA1492 

Thank you for posting on our Business Forum.

 

Regarding the issue you raised, we would like to collect additional details to help resolve your problem:

1.Could you please confirm whether you manage your router via the IP web interface, and whether you have attempted to complete registration via Controller Mode?
2.Please kindly provide your full network topology for our reference.
3.When attempting registration on the ER7406, have you reached out to your SIP provider to verify whether they have received your registration request?
4.Have you attempted troubleshooting by configuring port forwarding or enabling DMZ?
5.You mentioned that this problem started occurring after you updated the COMtrexx firmware to version 2.6. Could you please confirm whether you encountered any ER7406 registration issues before the firmware upgrade?

 

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#2
Re:ER7406 - Telekom Germany SIP registrations randomly fail (401 Unauthorized)
4 hours ago

  @Nathan-TP 

Thank you for your reply.

Please find my answers below:

  1. The ER7406 is managed via the Omada Controller (OC200). I have not tested standalone router mode.
  2. Network topology:

The setup with the ER7406 uses an ALLNET ALL-BM200VDSL2V VDSL modem in bridge mode:

Telekom VDSL connection
|
ALLNET ALL-BM200VDSL2V VDSL modem
|
ER7406 v1.0 (FW 1.3.2)
|
Auerswald COMtrexx PBX (FW 2.6)

 

During the test with the FRITZ!Box 7590, the ALLNET modem was not used because the FRITZ!Box established the DSL connection directly.

 

 

The COMtrexx is connected directly to one of the LAN ports of the ER7406. It performs SIP registrations to Telekom Germany and Peoplefone.

 

  1. I have not yet contacted Telekom regarding the issue. However, the PBX reports "401 Unauthorized" for the affected Telekom accounts after they lose registration.
  2. I have not tested port forwarding or DMZ because SIP registrations are initiated from the PBX towards the provider and should not require inbound port forwarding. Nevertheless, I can perform these tests if you believe they may provide useful diagnostic information.
  3. Unfortunately, I cannot say with certainty whether the issue existed before upgrading the COMtrexx to firmware 2.6. The problem became noticeable only after the upgrade. However, after replacing the ER7406 with a FRITZ!Box 7590 while keeping the same PBX, SIP accounts and internet connection, all registrations have remained stable for several days without any failures.

Because of this result, I am trying to determine whether there could be an interaction between the ER7406 NAT/UDP session handling and the SIP registration behavior introduced or changed in COMtrexx firmware 2.6.

If required, I can also provide screenshots, packet captures, or additional diagnostic information.

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#3

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