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Call Waiting on FXS on SIP Gateway

I have an analog phone connected to a FXS port on a 2851. The Cisco 2851 has a SIP dial peer to a Nextone SBC and Broadsoft SIP Servers for all inbound and outbound calls. I can not get call waiting to work. When I am on a call and the second call comes in, I do not hear the call waiting beep and the calling party gets a busy signal. The debugs on the 2851 shows it sending a 404 not found in response to the second invite. I am sure that call waiting should work. It works on Adtran routers so I am sure it can work on Cisco. I have the

dtmf-relay rtp-nte

configured under the SIP dial-peer. What am I missing?

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