01-06-2016 01:09 AM - edited 03-18-2019 05:23 AM
Dear ,
I would like to ask about VOIP Phone. I am using GRE VPN Tunnel between Head Office and Branches office. Currently I can ping the IP Addess of CUCM from Branches Office. And I had test to Port 5060 by TCPING . It is open. In this case , Can I use VOIP Phone in Branches office?
Do I need to create Voice VLAN in Branches Office ? Please see the attached file for my scenario.
Thanks and Regards,
Solved! Go to Solution.
01-06-2016 04:29 AM
You may wish to look at SRST - http://www.cisco.com/c/en/us/products/unified-communications/unified-survivable-remote-site-telephony/index.html
If SRST isn't an option, you can register the phones against your central call manager but they do need the ability to find it. Either pre-config the phones or rely on DHCP scope options. I've had to do this in the past, believe I created a voice VLAN as well.
Below from the manual.
Cisco IP Phones download their configuration from a TFTP server. When a Cisco IP Phone starts, if it does not have both the IP address and TFTP server IP address preconfigured, it sends a request with option 150 or 66 to the DHCP server to obtain this information.
DHCP option 150 provides the IP addresses of a list of TFTP servers.
DHCP option 66 gives the IP address or the hostname of a single TFTP server.
Joel
01-06-2016 09:02 AM
Hi Zayar,
Phones should always be in voice vlan which allows easy discovery of DHCP scope without manually entering the admin vlan information on ip phone. as long as you have full mesh connectivity between branch and HQ and DMZ there wont be any issue.
Thanks,
Vasanth
01-06-2016 04:29 AM
You may wish to look at SRST - http://www.cisco.com/c/en/us/products/unified-communications/unified-survivable-remote-site-telephony/index.html
If SRST isn't an option, you can register the phones against your central call manager but they do need the ability to find it. Either pre-config the phones or rely on DHCP scope options. I've had to do this in the past, believe I created a voice VLAN as well.
Below from the manual.
Cisco IP Phones download their configuration from a TFTP server. When a Cisco IP Phone starts, if it does not have both the IP address and TFTP server IP address preconfigured, it sends a request with option 150 or 66 to the DHCP server to obtain this information.
DHCP option 150 provides the IP addresses of a list of TFTP servers.
DHCP option 66 gives the IP address or the hostname of a single TFTP server.
Joel
01-06-2016 07:40 PM
Dear Joel,
So , I have to use below config in Branches Router ?
=======================
ip dhcp pool branch1
network 192.168.100.0 255.255.255.0
domain-name test.com
option 150 ip 172.16.100.109 172.16.100.110 <<<=This ip address is CUCM ip it locate in DMZ
dns-server 172.16.100.75
default-router 192.168.100.1
lease 3
========================
Thanks in Advance
01-06-2016 07:40 PM
Hi Zayar,
The above configuration looks fine to me.
Regards,
Vasanth
01-08-2016 04:49 AM
Dear Mr. Joel,
You are comment is very much helpful . Now I am compete project with your suggestion especially in option 150 -
Thanks you
Zayar
01-06-2016 09:02 AM
Hi Zayar,
Phones should always be in voice vlan which allows easy discovery of DHCP scope without manually entering the admin vlan information on ip phone. as long as you have full mesh connectivity between branch and HQ and DMZ there wont be any issue.
Thanks,
Vasanth
01-06-2016 06:26 PM
Dear Vasanth,
Could you please show the DHCP config for Branches Router especially Phone can connect to CUCM from DMZ Head office ?
Thanks and Regards,
Zayar
01-08-2016 12:56 AM
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