diff --git a/agent_based/cisco_cellular_lte.py b/agent_based/cisco_cellular_lte.py
index f62f652914104fc518664f5ad074a82678d57bfa..449c72dee0ed45d5f8e86f27d13118bbf6118f5d 100644
--- a/agent_based/cisco_cellular_lte.py
+++ b/agent_based/cisco_cellular_lte.py
@@ -28,6 +28,7 @@
 # IMEI -> International Mobile Equipment Identifier
 # ICCID -> Integrated Circuit Card ID
 # MSISDN -> Mobile Subscriber Integrated Services Digital Network Number
+# FSN -> Factory Serial Number
 # RSSI -> Received Signal Strength Indicator
 # RSRP -> Reference Signal Received Power
 # RSRQ -> Reference Signal Received Quality
diff --git a/agent_based/inv_cisco_cellular_lte.py b/agent_based/inv_cisco_cellular_lte.py
index 13232256fdd88ea3bf48320c8adb3ab538f418c4..0da92db900a982af5d03da59d9e90f85713c41e1 100644
--- a/agent_based/inv_cisco_cellular_lte.py
+++ b/agent_based/inv_cisco_cellular_lte.py
@@ -343,7 +343,7 @@ def parse_inv_cisco_cellular_lte(string_table: List[StringByteTable]):
             apn=apn,
         )
 
-    for oid_end, service_type, imsi, imei, iccid, msisdn, country, network, mcc, current_band in modem_table:
+    for oid_end, service_type, imsi, imei, iccid, msisdn, fsn, country, network, mcc, current_band in modem_table:
         if not country and mcc:
             country = _mobile_country_code.get(mcc, (None, None))[0]
 
@@ -355,6 +355,7 @@ def parse_inv_cisco_cellular_lte(string_table: List[StringByteTable]):
             'inventory_columns': {
                 'imsi': imsi if imsi else None,
                 'msisdn': msisdn if msisdn else None,
+                'fsn': fsn if fsn else None,
                 'country': country if country else None,
                 'network': network if network else None,
                 'current_band': _cisco_gsm_band.get(current_band, f'Unknown {current_band}'),
@@ -400,6 +401,7 @@ register.snmp_section(
             '3.1.1.2',  # c3gImei
             '3.1.1.3',  # c3gIccId
             '3.1.1.4',  # c3gMsisdn
+            '3.1.1.5',  # c3gFsn
             '3.2.1.8',  # c3gGsmCountry
             '3.2.1.9',  # c3gGsmNetwork
             '3.2.1.10',  # c3gGsmMcc
diff --git a/checkman/cisco_cellular_lte b/checkman/cisco_cellular_lte
index 08ef898bcf6eb7a7979de60090d54f9719bbbc5b..b38a3a75cc1f083ca8d231a8fc9d2fea8fd634c3 100644
--- a/checkman/cisco_cellular_lte
+++ b/checkman/cisco_cellular_lte
@@ -1,45 +1,25 @@
-title: Dummy check man page - used as template for new check manuals
-agents: linux, windows, aix, solaris, hpux, vms, freebsd, snmp
-catalog: see modules/catalog.py for possible values
+title: Cisco cellular LTE
+agents: snmp
+catalog: hw/network/cisco
 license: GPL
-distribution: check_mk
+distribution: https://thl-cmk.hopto.org
 description:
- Describe here: (1) what the check actually does, (2) under which
- circumstances it goes warning/critical, (3) which devices are supported
- by the check, (4) if the check requires a separated plugin or
- tool or separate configuration on the target host.
+ This check plugin will monitor 2G/3G/4G wireless modems and there associated connections. By default it will only
+ discover cellular modems with a SIM card/connectin attached. It was tested with the integrated modem of the
+ Cisco ISR1100 series routers and the with a NIM in a Cisco ISR4451. Each modem can have up to two connections at
+ the same time (over one SIM-card). The integrated modems and also newer NIM modules have dual SIM-card capabilities.
+ Dual SIM-Cards can be usesd in a redundancy failover manner. Only one SIM-Card will be active at any given time.
 
-item:
- Describe the syntax and meaning of the check's item here. Provide all
- information one needs if coding a manual check with {checks +=} in {main.mk}.
- Give an example.  If the check uses {None} as sole item,
- then leave out this section.
 
-examples:
- # Give examples for configuration in {main.mk} here. If the check has
- # configuration variable, then give example for them here.
+ There is one WATO rule for the discovery and one for the service it self. You will find both rules under
+ the label "Cisco cellular LTE".
 
- # set default levels to 40 and 60 percent:
- foo_default_values = (40, 60)
 
- # another configuration variable here:
- inventory_foo_filter = [ "superfoo", "superfoo2" ]
+ In the discovery rule you can decide to discover cellular interfaces without attched SIM-card/connection also.
 
-perfdata:
- Describe precisely the number and meaning of performance variables
- the check sends. If it outputs no performance data, then leave out this
- section.
+item:
+ By default the item is the name of the celluar interface used i.e: Ce0/2/0.
 
 inventory:
- Describe how the inventory for the check works. Which items
- will it find? Describe the influence of check specific
- configuration parameters to the inventory.
-
-[parameters]
-foofirst(int): describe the first parameter here (if parameters are grouped
-        as tuple)
-fooother(string): describe another parameter here.
+ The discovery will find all Cisco devices identified by the sysObjectID and there cellular connections.
 
-[configuration]
-foo_default_levels(int, int): Describe global configuration variable of
-    foo here. Important: also tell the user how they are preset.
diff --git a/cisco_cellular_lte.mkp b/cisco_cellular_lte.mkp
index dd38d7eb17bf06563a878350a36dd4d4dd1d8f0c..8856b2e231159e3f9908b6007de6cf5a07aa4eeb 100644
Binary files a/cisco_cellular_lte.mkp and b/cisco_cellular_lte.mkp differ
diff --git a/packages/cisco_cellular_lte b/packages/cisco_cellular_lte
index e1783f5594d106f40814763e7687c3dec0ef523d..b197fed6af17032fa3d0b4ff9b95f46a4f43a7b9 100644
--- a/packages/cisco_cellular_lte
+++ b/packages/cisco_cellular_lte
@@ -4,11 +4,12 @@
  'download_url': 'https://thl-cmk.hopto.org',
  'files': {'agent_based': ['cisco_cellular_lte.py',
                            'inv_cisco_cellular_lte.py'],
+           'checkman': ['cisco_cellular_lte'],
            'web': ['plugins/wato/cisco_cellular_lte.py',
                    'plugins/metrics/cisco_cellular_lte.py',
                    'plugins/views/inv_cisco_cellular_lte.py']},
  'name': 'cisco_cellular_lte',
- 'num_files': 5,
+ 'num_files': 6,
  'title': 'Cisco cellular LTE',
  'version': '20220920.v0.0.1',
  'version.min_required': '2.0.0',
diff --git a/web/plugins/views/inv_cisco_cellular_lte.py b/web/plugins/views/inv_cisco_cellular_lte.py
index 2d3604ae739648cbed3d1bb7f740cf81e2ef393a..61170d733184075959507442b1827f31008dcdfe 100644
--- a/web/plugins/views/inv_cisco_cellular_lte.py
+++ b/web/plugins/views/inv_cisco_cellular_lte.py
@@ -23,6 +23,7 @@ inventory_displayhints.update({
             'imei',
             'iccid',
             'imsi',
+            'fsn',
             'network',
             'country',
             'apn',
@@ -38,6 +39,7 @@ inventory_displayhints.update({
         'short': _('MSISDN'),
         'title': _('Mobile Subscriber Integrated Services Digital Network Number (MSISDN')
     },
+    '.networking.cellular:*.fsn': {'short': _('FSN'), 'title': _('Factory serial Number (FSN)')},
     '.networking.cellular:*.country': {'title': _('Country'), },
     '.networking.cellular:*.network': {'title': _('Network'), },
     '.networking.cellular:*.current_band': {'title': _('Current band'), },