Failed to Register Extension - Caused by SonicWall App Control

Applicability

  • Firmware version: Any
  • Model: S-Series

Problem Description

The client report he could not register the extension on his IP phone via VPN network. The ping is good from IP phone network to PBX network.

Analysis

1 - In PBX log, it shows no REGISTER packets from IP phone.

2 - PBX firewall was disabled.

3 - The SIP log captured on IP phone shows no response from PBX.

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Therefore, the problem should be the network, firewall blcok or NAT settings of the router.

However SIP Transmission option on SonicWall  has been disabled.

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Solution

The client's IT disabled the App Control for SIP Register packets. Then the registration became normal.

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