Question about D-Link DPH-80S Phone (DPH80S)

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Line drops when calling pstn number through

I've registered my voxalot ( account in my dph80. I'm able to call my voxalot contacts, using their voxalot numbers and have a conversation as long as I like, without any trouble.
when calling my pstn contacts with the dph80, by making use of a vsp, which I registered in Voxalot, there's a problem. The line drops as soon as the call is picked up from the other side.
When my voxalot account is registered in my pap2t, I can call my pstn contacts and have a conversation.
My sip configuration details in the dph80:
user name: xxxxxx (my 6 digit voxalot number)
pasw: ******** (my voxalot passw)
phone number: xxxxxx (my 6 digit voxalot number)
phone port: 5060
proxy server address:
proxy server port: 5060
domain name:
outbound proxy address:
expiration time (in sec): 3600

Thanks and regards,

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