diff --git a/docs/configuring-playbook-matrix-sms-bridge.md b/docs/configuring-playbook-matrix-sms-bridge.md
index b3629ce5f..00aaececc 100644
--- a/docs/configuring-playbook-matrix-sms-bridge.md
+++ b/docs/configuring-playbook-matrix-sms-bridge.md
@@ -17,7 +17,9 @@ matrix_sms_bridge_gammu_modem: "/path/to/modem"
 # generate a secret passwort e.g. with pwgen -s 64 1
 matrix_sms_bridge_database_password: ""
 # (optional) a room id to a default room
-matrix_sms_bridge_default_room: ""
+matrix_sms_bridge_default_room: "" 
+# (optional) gammu reset frequency (see https://wammu.eu/docs/manual/smsd/config.html#option-ResetFrequency)
+matrix_sms_bridge_gammu_reset_frequency: 3600
 # (optional) group with unix read and write rights to modem
 matrix_sms_bridge_modem_group: 'dialout'
 ```
diff --git a/roles/matrix-sms-bridge/defaults/main.yml b/roles/matrix-sms-bridge/defaults/main.yml
index 1e0bfaa3c..610b8f469 100644
--- a/roles/matrix-sms-bridge/defaults/main.yml
+++ b/roles/matrix-sms-bridge/defaults/main.yml
@@ -49,6 +49,8 @@ matrix_sms_bridge_default_room: ''
 
 matrix_sms_bridge_gammu_modem: ''
 matrix_sms_bridge_modem_group: 'dialout'
+matrix_sms_bridge_gammu_reset_frequency: 0
+
 
 matrix_sms_bridge_configuration_yaml: |
   #jinja2: lstrip_blocks: "True"
@@ -122,6 +124,7 @@ matrix_sms_bridge_gammu_configuration: |
   InboxFormat = detail
   OutboxFormat = detail
   TransmitFormat = auto
+  ResetFrequency = {{ matrix_sms_bridge_gammu_reset_frequency }}
   debugLevel = 1
   LogFile = /data/log/smsd.log
   DeliveryReport = log