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--- networking:cisco-2801-cme [25/03/2026 12:44] – [ISDN] 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>
+===== Basic telephony service =====
+<code>
+-1#sh telephony-service
+CONFIG (Version=8.6)
+=====================
+Version 8.6
+protocol mode default
+ip source-address 192.168.101.102 port 2000
+ip qos dscp:
+ ef (the MS 6 bits, 46, in ToS, 0xB8) for media
+ cs3 (the MS 6 bits, 24, in ToS, 0x60) for signal
+ af41 (the MS 6 bits, 34, in ToS, 0x88) for video
+ default (the MS 6 bits, 0, in ToS, 0x0) for serviceservice directed-pickup
+load 7911 SCCP45.8-5-2S
+max-ephones 30
+... edited ...
+</code>
 <code>
@@ Line 129: / Line 214: @@
 Router(config)#
 </code>
+<code>
+-1(config)#telephony-service
+-1(config-telephony)#ip source-address 192.168.101.102 port 2000
+-1(config-telephony)#ip source-address 192.168.101.11 port 2000
+-1(config-telephony)#
+-1(config-telephony)#crea
+-1(config-telephony)#create cn
+-1(config-telephony)#create cnf-files
+Creating CNF files
+-1(config-telephony)#
+</code>
+====== Voice Port ======
 <code>
@@ Line 137: / 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 208: / 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.