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--- networking:cisco-2801-cme [14/04/2026 16:28] – andrew
+++ networking:cisco-2801-cme [14/04/2026 21:11] (current) – [DHCP service] andrew
@@ Line 121: / Line 121: @@
 [[https://www.mattmillman.com/info/a-crash-course-in-using-gpo-telephones-in-the-modern-world/|Using Analogue BT phones in DTMF]]
+===== DHCP service =====
+If your router is required to offer DHCP, use this:-
+<code>
+ip dhcp excluded-address 192.168.101.1 192.168.101.50
+ip dhcp pool voip
+ network 192.168.101.0 255.255.255.0
+ default-router 192.168.101.1
+ dns-server 192.168.101.1
+ domain-name voip.rainsbrook.co.uk
+!
+</code>
+To see leases offered out, don't use this:-
+<code>
+-1#sh dhcp ?
+  lease   Show DHCP Addresses leased from a server
+  server  Show DHCP Servers we know about
+-1#
+</code>
+This is to see leases offered **TO** the router, not **from** it.
+Use this instead:-
+<code>
+-1#sh ip dhcp ?
+  binding   DHCP address bindings
+  conflict  DHCP address conflicts
+  database  DHCP database agents
+  import    Show Imported Parameters
+  pool      DHCP pools information
+  relay     Miscellaneous DHCP relay information
+  server    Miscellaneous DHCP server information
+-1#sh ip dhcp binding
+Bindings from all pools not associated with VRF:
+IP address          Client-ID/              Lease expiration        Type
+                    Hardware address/
+                    User name
+.168.101.52      01a8.b1d4.fbc3.9b       Apr 15 2026 05:16 PM    Automatic
+.168.101.53      01a0.cec8.e11f.0f       Apr 15 2026 05:09 PM    Automatic
+-1#
+-1#sh ip dhcp pool voip
+Pool voip :
+ Utilization mark (high/low)    : 100 / 0
+ Subnet size (first/next)       : 0 / 0
+ Total addresses                : 254
+ Leased addresses               : 2
+ Pending event                  : none
+subnet is currently in the pool :
+ Current index        IP address range                    Leased addresses
+.168.101.54       192.168.101.1    - 192.168.101.254   2
+-1#
+</code>
@@ Line 170: / Line 229: @@
 </code>
+====== Voice Port ======
 <code>
@@ Line 178: / Line 239: @@
 /2/0           --  fxs-ls      up    dorm on-hook  idle     y
 /2/1           --  fxs-ls      up    dorm on-hook  idle     y
+</code>
+<code>
+ephone-dn  1
+ number 1001
+!
+ephone  1
+ device-security-mode none
+ mac-address A8B1.D4FB.C39B
+ type 7911
+ button  1:1
 </code>
@@ Line 249: / Line 325: @@
 {{:voip:7911-phone.jpg?200|7911 voip phone}}
+==== Factory Reset ====
+  - Start by unplugging the power connector or POE and then plug it back in. The phone will start it's power up cycle.
+  - While the phone is starting up, before the Applications Menu button flashes, press and hold the octothorpe button(#). Continue to hold # until the red LED on the telephone handset flashes.
+  - Release the octothorpe and press all the keypad digits:-  123456789*0#
+  - The phone will reboot and attempt to reconfigure itself.