Protocol recommendation for voice gateway connected to both PRI & SIP trunks

If I want to use a single Cisco 2921 voice gateway connected to both PRI provider as primary and SIP ITSP as backup, which vg protocol would you experts recommend?  H323 or SIP?  and why?  Thanks in advance -
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Pro4iaAsked:
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José MéndezConnect With a Mentor Commented:
SIP.

H323 is legacy and far more complex to troubleshoot. You will find better support when troubleshooting issues for SIP too.
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Pro4iaAuthor Commented:
Thanks www.  Would you prefer SIP when only using PRI also?
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José MéndezCommented:
Yes, no problem there.
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