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What Voip phone system is it?
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We have a Cisco 2811 and are separating our server/user traffic by putting the users on a separate LAN. &nbsp;Currently all devices are in the 192.168.100.0/24 subnet. &nbsp;After the split it will be:<br />
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F0/0 - 192.168.100.1/24 - This is the server subnet<br />
F0/1 - 192.168.101.1/24 - This is the user subnet<br />
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The office just installed a new voip phone system a couple weeks ago. &nbsp;Since there were not two RJ45 jacks installed in all the offices/cubicles the network cable runs to the phone and then from the phone to the PC and they share an IP address. &nbsp;This has been working fine on the single subnet setup.<br />
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We have configured F0/1 and took a user and gave them a static IP on the 192.168.101.0/24 subnet for testing. &nbsp;The PC works fine and they are able to get around the network and reach across the corporate WAN successfully. &nbsp;However the phone doesn't work. &nbsp;It states 'no system found' which we are guessing means it can't connect to the phone server that is on the 192.168.100.0/24 subnet.<br />
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I have added the 'ip helper-address' command to the interface so we can get DHCP working in the new subnet but that isn't giving the phones a connection.
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We have a Cisco 2811 and are separating our server/user traffic by putting the users on a separate LAN.  Currently all devices are in the 192.168.100.0/24 subnet.  After the split it will be:

F0/0 - 192.168.100.1/24 - This is the server subnet
F0/1 - 192.168.101.1/24 - This is the user subnet

The office just installed a new voip phone system a couple weeks ago.  Since there were not two RJ45 jacks installed in all the offices/cubicles the network cable runs to the phone and then from the phone to the PC and they share an IP address.  This has been working fine on the single subnet setup.

We have configured F0/1 and took a user and gave them a static IP on the 192.168.101.0/24 subnet for testing.  The PC works fine and they are able to get around the network and reach across the corporate WAN successfully.  However the phone doesn't work.  It states 'no system found' which we are guessing means it can't connect to the phone server that is on the 192.168.100.0/24 subnet.

I have added the 'ip helper-address' command to the interface so we can get DHCP working in the new subnet but that isn't giving the phones a connection.

VOIP phones not reaching server across router

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

Voice Over IP

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.