Per the Wild Caller (Summoner) archetype description at http://paizo.com/pathfinderRPG/prd/advancedRaceGuide/coreRaces/halfElves.html the Summon Monster spells and ability should be replaced with Summon Nature's Ally. At 19th level, Gate should be replaced with Summon Elder Worm or Summon Froghemoth.
I assume that this would prevent Wild Callers from taking the Extra Summons feat from Ultimate Magic, as it is ambiguous in this case.
Reviewing the code, it appears to be correct. Reviewing attached character.
When I apply the Archetype 'Wild Caller' the Summon Monster is indeed swapped out for Summon Nature's Ally.
I'll note the attached character did not have an archetype applied.
Applying the Wild Caller archetype does swap Summon Nature's Ally in for Summon Monster on the Special Qualities section of the character sheet.
However, the same substitution should be made on the spell lists. Quoting the source material:
Spells: A wild caller does not have access to summon monster spells. Instead, he swaps out those spells on his spell list with summon nature's ally spells of the same level. This ability alters the normal spell list of the summoner.
At revision: 22520