Cisco CME SIP extension as X-lite Phone
1- Allows SIP phones to call other SIP phones and H323 calls
voice service voip
allow-connections sip to sip
allow-connections sip to H323
allow-connections H323 to sip
allow-connections H323 to H323
2- Enable IOS SIP Registrar
sip
registrar server expires max 1200 min 300
3- configure the voice register configuration The “voice register global” configuration is similar to the telephony-service configurations used for SCCP phones.
Cisco CME and ephone Button Command attributes
: Normal Ring
b Call waiting Beep No ring
f Feature Ring
m Monitor mode
o Overlay Line no call waiting
c Overlay Line with call waiting
x Overlay expansion /Roll over
s Silent Ring
w Watch mode
Button Number (Attribute ) Directory Number
For Example if we have to configure one line when call comes there are silent ring on button no 2 and ephone-dn 10
#button 2 s 10
How to configure second interface in vCenter Server Appliance
Some time we require one more ethernet to be configured in vCenter Server Appliance .
It does not shows in vCenter web interface to configure it .below are the small trick .
1- Connect to the VCSA via SSH (default username and password is root/vmware)
2- Copy /etc/sysconfig/networking/devices/ifcfg-eth0 to /etc/sysconfig/networking/devices/ifcfg-eth1
3- Edit ifcfg-eth1 and replace the networking information with your values, here is how mine looks:
DEVICE=eth1
BOOTPROTO=’static’
STARTMODE=’auto’
TYPE=Ethernet
USERCONTROL=’no’
IPADDR=’172.16.1.52′
NETMASK=’255.255.255.0′
BROADCAST=’172.16.1.255′
4- Create a symlink for this file in /etc/sysconfig/network
ln -s /etc/sysconfig/networking/devices/ifcfg-eth1 /etc/sysconfig/network/ifcfg-eth1
5-Restart the networking service to activate the new setup:
#service network restart
6- Check the VCSA web management interface to verify that the new settings are active
How to assign IP address manually vCenter Appliance
/opt/vmware/share/vami/vami_config_net
Reboot the server
now access your vCenter Server https://192.168.1.100:5480
How to configure Cisco router as NTP server
1- you have to obtain public NTP server addresses from www.ntp.org
2- configure you router with NTP server IP
GK_RTR#configure terminal
GK_RTR(config)#ntp server 64.209.210.20
GK_RTR(config)#ntp source lo
GK_RTR(config)# ntp master
GK_RTR(config)#clock timezone ARIZONA -7
3- Verifying NTP Configurations
GK_RTR#show ntp associations
GK_RTR#show clock
4- After you configure the Cisco router to synchronize with an NTP server, you can configure it to provide date and time information to a CUCM server and other devices,
Note :- If you want to allow your Router act as NTP server and specify specific interface to provide NTP services then you have to give command “ntp source ” before “ntp master” otherwise it will give NTP services from 127.0.0.1 .
Cisco Router as DHCP Server
Using a Cisco router as a DHCP server is a somewhat common practice in smaller networks.In this example we have two VLANs one for Voice and one for DATA.
DATA VLAN IP Nework Range 172.16.1.0 Gateway IP 172.16.1.1 DNS Server 10.31.144.1
Voice VLAN IP Nework Range 172.16.2.0 Gateway IP 172.16.2.1 DNS Server 10.31.144.1
TFTP Server for Cisco Phones 172.16.2.1
GK_RTR#configure terminal
GK_RTR(config)#ip dhcp excluded-address 172.16.1.1 172.16.1.9
GK_RTR(config)#ip dhcp excluded-address 172.16.2.1 172.16.2.9
GK_RTR(config)#ip dhcp pool DATA_SCOPE
GK_RTR(dhcp-config)#network 172.16.1.0 255.255.255.0
GK_RTR(dhcp-config)#default-router 172.16.1.1
GK_RTR(dhcp-config)#dns-server 10.31.144.1
GK_RTR(dhcp-config)#exit
GK_RTR(config)#ip dhcp pool VOICE_SCOPE
GK_RTR(dhcp-config)#network 172.16.2.0 255.255.255.0
GK_RTR(dhcp-config)#default-router 172.16.2.1
GK_RTR(dhcp-config)#option 150 ip 172.16.2.1
GK_RTR(dhcp-config)#dns-server 10.31.144.1
If you are using Windows server or some other centralized device for DHCP services. Even Cisco Unified Communications Manager includes DHCP server capabilities. you need to configure ip helper-address <central DHCP server IP address> to your VLAN interface to forward DHCP requests to the central DHCP server for the voice and Data VLANs.
How to calculate PVDM requirement for Cisco IP Telephony
DSP (Digital Signal Processors) is a chip that performs all the sampling, encoding, and compression functions on audio coming into your router .DSPs typically come in chips to install in your Cisco router that look like old memory SIMMs.
Cisco bundles these DSP chips into Packet Voice DSP modules (PVDM)
Cisco provides a DSP calculator that provides the number of DSP chips you need to
purchase based on the voice network you are supporting. This tool can be found at
www.cisco.com/web/applicat/dsprecal/index.html Note :- require CCO login
How to configure T1/E1 controller on Cisco 2800 router
1- check physical location of card slot to check run command
# sh diag
it will show you WIC slot no
WIC Slot 0:
VWIC2-1MFT-T1/E1 – 1-Port RJ-48 Multiflex Trunk – T1/E1
Hardware Revision : 0.0
2- initialize the E1 T1 controller card
PSTN(config)#card type ?
e1 E1
t1 T1
PSTN(config)#card type e1 ?
<0-2> Card slot number (always 0 for 1800 series & 2801 routers)
PSTN(config)#card type e1 ?
<0-2> Card slot number (always 0 for 1800 series & 2801 routers)
PSTN(config)#card type e1 0 ?
<0-3> WIC slot number (0:WIC, 1:Onboard for NM-HDV2)
PSTN(config)#card type e1 0 0 ?
<cr>
ISDN T1 E1 Troubleshooting TEI_ASSIGNED
ISDN Status as TEI_ASSIGNED meaning
Which indicates that the PRI does not exchange Layer 2 frames with the Telco switch. Use the show controller e1 x command to first check the controller t1 circuit, and verify whether it is error free before troubleshooting ISDN Layer 2 problem with the debug isdn q921 command.
Symptoms :- ISDN layer 1 is active and Layer 2 going up and down with error “TEI_ASSIGNED”
There could be following missing command under signaling interface at Telco end if they are using Cisco Gateway.
isdn protocol-emulate network
interface Serial0/0/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable
Cisco trouble shooting guides
E1 Troubleshooting Troubleshooting flowchart E1 Troubleshooting Flow chart T1
Remote Host Identification Has Changed error and solution
When we run scp command to copy data to remote host its gives us error
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Solution is
$ ssh-keygen -R {server.name.com}
$ ssh-keygen -R {ssh.server.ip.address}
$ ssh-keygen -R server.example.com
sample output
root@webserver html]# ssh-keygen -R 192.168.1.10
/root/.ssh/known_hosts updated.
Original contents retained as /root/.ssh/known_hosts.old
source ssh error