Accepted Solutions
your phone should have TFTP server information 192.168.20.1. if the phone takes IP through DHCP which is configured on Cisco switch or router you need the add the command in bold.
Exmaple.
Ip dhcp pool local phones
network x.x.x..0 255.255.255.0
default-router x.x.x.1
option 150 ip y.y.y.y
if the IP is assigned static, you need to add the TFTP address manually.
one more thing I didn't see voice register pool and dn configured from your shared configuration. hope you have configured it.
If it’s on-prem and registers with CUCM it sounds like it doesn’t get any TFTP server via option 150 from DHCP. Have you checked that the phone has this in settings and if not if it’s present in your DHCP scope?
As you can see on your pictures the phone has no TFTP server defined. Without this the phone would not be able to get the configuration from CUCM. If you don’t have any experience with this I would recommend you to reach out to a reputable Cisco partner for help or at a minimum read up on the topic at hand to learn the basics.
What call processing service are you using? For phones to get configuration from CUCM they require a TFTP server to connect to. If you have any other call processing service than CUCM it’s an all together different thing.
It also uses TFTP to pass on the configuration to the phones. Would you mind to post the configuration of CME in an attached file so that we can verify the configuration?
In the CME configuration you have a DHCP pool (same thing known as a scope in other DHCP setups) defined, however it’s not the one that is used by the phones to get the IP address as the DNS servers are totally different in this pool then the once in your pictures for settings on the phone. As I previously already wrote and now also @Nithin Eluvathingal option 150 is needed in the DHCP scope for the phone to get the TFTP server as it’s from there the phones would get it’s configuration. Without it it has no idea on how to register. That’s the situation you’re in with the phone you cleared the service mode on.
Also on the CME you have another option configured on the DHCP pool, option 43. What is that used for, I’ve never seen that before?
your phone should have TFTP server information 192.168.20.1. if the phone takes IP through DHCP which is configured on Cisco switch or router you need the add the command in bold.
Exmaple.
Ip dhcp pool local phones
network x.x.x..0 255.255.255.0
default-router x.x.x.1
option 150 ip y.y.y.y
if the IP is assigned static, you need to add the TFTP address manually.
one more thing I didn't see voice register pool and dn configured from your shared configuration. hope you have configured it.
