'create an effect similar to the spell sound burst (having the same range and area and allowing the same saving throw).' - Thunder Call doesn't specify SR and is supernatural, so there's no call for a SR check. It doesn't say mimics, it says similar to.
"Supernatural Abilities: These can’t be disrupted in combat and generally don’t provoke attacks of opportunity. They aren’t subject to spell resistance, counterspells, or dispel magic, and don’t function in antimagic areas." CRB pg. 221
A supernatural ability isn't affected by spell resistance, no matter how much it says to imitate a spell.