asterisk users - Nov 2017 - Broken? SIP/devicename/extension/IPorHost

I tried many times and this dial model fails for me
SIP/g729-outbound/15555555555/192.168.1.120
The peer g729-outbound does exist but it does not have a host line,
that is why I am supplying the host dynamically for each call.
According Asterisk13 file configs/samples/sip.conf.sample, this is legal.
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