Subnet mask for 2 different networks

Hello Experts, we are installing some VOIP phones, and they are using dual network spliters, to avoid installing another NIC on the pc´s...

However:

PC1 has 192.168.5.200 - and the phone will have 192.168.2.10

they cannot see each other (ping) can I just re-adjust subnet mask to 255.255.248.0 ?

thanks
enigmateamAsked:
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tmwsiyConnect With a Mentor Commented:
I would just do 255.255.0.0 and be done with it :)
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BrianCommented:
That subnet mask does include both of those IPs.
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enigmateamAuthor Commented:
so i have to setup the subnet mask 255.255.248.0 or 255.255.0.0 on EVERY pc?

or just in my router?
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tmwsiyCommented:
On each machine and the router if want them all to talk .
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BrianConnect With a Mentor Commented:
Every PC and device that is Static and your DHCP server.
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enigmateamAuthor Commented:
thanks will test it tomorrow and will tell u guys

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justgrand19Commented:
the best way is to setup vlans if you switch will support it. I would check with your phone vendor to see if it is supported. That way your phones will not talk to your computers and you can use just one Ethernet drop to both.
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tmwsiyCommented:
He said he had an unmanaged switch
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