Problem VoIP over site-to-site VPN one side works other not

I have set up two site first my intention to make all calls on SIP but didnt work out for me . so one end on VPN and other end on sip bit funny , was working ok now when I upgraded my sonicwall PRO 2040 to NSA 2400 and other site TZ 170 having issues
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More about problem voip site site side works
  1. I just use a Personal VPN for 15 bucks a month and it solves all issues with my Vonage phones when traveling. Voice quality is very high.
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