diff --git a/src/sipcentric/__init__.py b/src/sipcentric/__init__.py
index 2563220..2378ad1 100644
--- a/src/sipcentric/__init__.py
+++ b/src/sipcentric/__init__.py
@@ -11,6 +11,7 @@ import math
 import requests
 import time
 import logging
+import urllib.parse
 
 import simplejson as json
 
@@ -241,7 +242,10 @@ class Customer(APIObject):
             yield PhoneNumber(self._api, data=c)
 
     def calls(self, params=None):
-        for c in self._api.getMany(Call.makeUrl(parent=self, params=params, pageSize=100)):
+        if params is None:
+            params = {}
+        params['pageSize'] = 500
+        for c in self._api.getMany(Call.makeUrl(parent=self), params=params):
             yield Call(self._api, data=c)
 
     def callbundles(self):