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I have an Archer VR1200v, the telephone works perfectly but i have a huge problem, after exaclty 3 minutes, the phone line drops.
You can see here an example:
I have this problem with both Outgoing and Incoming Calls. I checked all my telephony settings and they seems all right.
Can you help me? I need it so much. Thanks.
This is my telephone: https://www.gigaset.com/it_it/gigaset-c570-system-it/
I have Fastweb as ISP and these are its voip settings:
3. Requirements and settings related to VoIP service
SIP support (RFC 3261)
DNS query support for address resolution of Fastweb SIP network access proxy
SIP proxy: voip.fastwebnet.it
Proxy SIP Port: 5060
SIP Transport Protocol: UDP
Support for the PRACK method (RFC 3262)
Support OPTIONS method
REGISTER expires time: 3600 s
INVITE Expires: set to a value greater than 430 s
Supported codecs: G.729 G.729A (including version A, versions B and AB NOT supported), G.711 A-law
VAD (Voice Activity Detection): disabled
Packetization time: 20ms
DTMF tone support: in-band telephone-event (RFC 2833)
Fax protocol: only T.38
IP traffic QoS marking:
SIP and RTP: DSCP CS5
Data: DSCP 0
I tried EVERYTHING, that's something wrong the TP-Link.
As you can see, every call last 3 minutes maximum. 
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