SIP-T20P: Register Failedand and no Call

[sylviog.jr]

Dear sirs, we have any IP Phones model T20P. I need a help. We connect 2 T20P in 2 notebooks (connected a local server) and make the follows configurations for test:

Notebook 1:
IPv4
Static IP 192.168.1.192
Mask 255.255.255.0
Gateway 192.168.1.1
DNS 192.168.1.1
Display Name Flavio
Label Flavio
Register name 501
User name 501
SIP Server 1
Server Host 192.168.1.1 (put the gateway)
Result: Account 1 501@192.168.1.1 : Register Failed

Notebook 2: The same above, but with this difference on second:
Static IP 192.168.1.191
Display Name Sylvio
Label Sylvio
Register name 500
User name 500
Result: Account 1 500@192.168.1.1 : Register Failed

Please, where I am going wrong? Dont Register and the call 500 or 501 between thers and not connetc. Sorry my english. I live in Brazil.
See print of my config


Thanks in advance,
Sylvio Gomes Junior