Converting a Cisco 7821 SCCP Phone to a SIP Phone

[Ahmd Murad]

How can you convert Cisco 7821 SCCP Phone to a SIP Phone ?

[Nadeem Ahmed]

Hello,

Do you have CME or CUCM?

Br,

Nadeem

[Ahmd Murad]

Hi,

     None, I'm trying to use the phone with hosted VoIP services.

[Nadeem Ahmed]

There are many blog available on google converting Cisco IP  phone from SCCP to SIP here are some.

Please refer the same.

http://www.voipsupply.com/blog/voip-insider/tech-tip-converting-a-cisco-ip-phone-from-sccp-skinny-to-sip-firmware/

http://www.3cx.com/blog/docs/cisco-7940-sip/

Br,
Nadeem

[Mohamed Amine Jaafar]

Your 7821 IP phone must already be working with SIP.

There's no Skinny for 78xx nor 88xx nor newer IP phone models.

[Ahmd Murad]

The phone is now displaying the following information ..

rootfs78xx.10-2-1-12SR1-4
Boot Load ID		sboot78xx.6120-10-2-1-12SR1-4
Version		sip78xx.10-2-1-12SR1-4
Hardware Revision		V02
Model Number		CP-7821

The phone is displaying "Phone Not Registered message" ... How can i get the phone configured through tftp ?

[Mohammed al Baqari]

Hi,

You need your VoIP hosted server to have the tftp file and you need DHCP options to point the phone to the hosted VoIP server.

[eric.ahernandez]

Hello Ahmd,

As Mohammed said you need to configure option 150 on the DHCP so you can point out the TFTP server to the IP Phones and they should be able to reach it so they can download the .xml config files for the phones.

Also check which VoIP system and version are they using on the voip hosted services to see if it supports the 7821 or if they need to upload the firmware or a devicepack and then restart the TFTP Service on the system.