21251: Trunking CPS change not allowedERROR: 21251error-21251 page anchorELASTIC SIP TRUNKINGERROR Descriptiondescription page anchorTrunking CPS change not allowed Possible Causespossible-causes page anchor This CPS change is not allowed. Possible Solutionspossible-solutions page anchor This CPS change is not allowed, kindly contact Twilio Support.