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On first run of Snom we strongly recommend that you secure the web interface in order to protect your phone against remote attacks. Therefore the HTTP User and Password as well as the Administrator Password should be changed from the default value.

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Setting-Up the phone for TLS

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Your phone also acts as a client in a couple of cases. E.g. if you register to a secure SIP proxy or if you open a Action URL over HTTPS. Normally, you do not need to worry about the server identification. Snom phones do not verify server identities by default. From FW version 8.2.30 you can explicitly state to verify server certificates though. You can activate the feature on the certificates page of the web interface:

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Please carefully enable the feature. The phone will reject all secure connections of peers offering an unknown certificate that could not be verified by one of build-in CA's of the snom phone. Please refer to the Certificate Authorities tab to see which authorities are supported by the phone. Due to security concerns, you can only disable the feauture by resetting the phone to the factory defaults.

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A certificate is trusted if its signature is signed by a certificate authority. Snom has pre-installed a couple of CA's which are listed on the Certificate Authorities tab of the Certificates page:

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All rejected certificates are listed in the Unknown Certificates tab. If you persist on trusting the identification you can add it as an exception:

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Henceforward, the certificate is listed in the Server Certificates tab and a connection to this identification is no longer rejected. Currently, this is the only way to add unknwon server certificates to the phone.

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Step 1Step 2

Navigate to the Setup/Identity1 page, login tab:

  • Set Account, Authentication Username and password with the correct
    data that you have.
  • Set Registrar with the IP Address (or DNS) of Server Sip.
  • Set Outbound Proxy in this form : ‘sips:ip_of_the_srv(or dns):5061’

Goto in the Setup/Identity1 page, SIP tab:

  • Set Support Broken registrar to ON. 
  • DTMF via SIP Info set to ON.
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Step 3Step 4

Goto in the Setup/Identity1 page, RTP tab:

  • Set RTP Encryption to ON.
  • Set SRTP Auth-tag to AES-32.
  • Set RTP/SAVP to Mandatory.
  • Set Packet Size to 20ms.
  • Set Media Transport Offer to UDP.

Goto in the Certificates:

  • Enable the server identity check in TLS connection by pushing the "TLS" button in
    "Unknown Certificates".
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Advanced Configuration of the SNOM 300/320:

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Step 1Step 2

Navigate to the Setup/Function Keys page:

  • Choose a dial pad button to edit (in the example it's P5)
  • Click on the drop-down menu of the "Action" (i.e. the second column)

 

  • Choose "DTMF"
  • Save by pushing the "Save" button at the bottom of the form
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Step 3Step 4
Insert the "*1*" string in the third column: These DTMF activate the transfer mode.

Act the same way for another dial button (i.e. P4) but this time insert the "*3*" DTMF

train: this one activates the "3-way call"

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