diff --git a/api/pkg/model/callrequest.go b/api/pkg/model/callrequest.go
index 68fee09..d237c42 100644
--- a/api/pkg/model/callrequest.go
+++ b/api/pkg/model/callrequest.go
@@ -34,8 +34,8 @@ func (cr *CallRequest) Validate() error {
 	if cr == nil {
 		return merrors.InvalidArgument("request payload is empty", "request")
 	}
-	if cr.Phone == "" {
-		return merrors.InvalidArgument("phone must not be empty", "request.phone")
+	if cr.Phone == "" && cr.Email == "" {
+		return merrors.InvalidArgument("phone or email must not be empty", "request.phone", "request.email")
 	}
 	return nil
 }