IP Telephony and Phones

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Trying to update some 7821 phones from sip78xx.10-1-1SR1-4 without CUCM. Setup:1. DHCP server with option 1502. TFTP server3. Downloaded Firmware 78xx.10-1-1SR2-1.zip file. But getting attached error on TFTP server. 

tftp-error.JPG
Moashir by Community Member
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I have many cp-6945 and cp-9971 phones.The pushing of # at boot, and then typing 123456789*0# method works for cp-6945 but not for cp-9971.There's a CP-9971 phone, which works fine but has it's display divided to two, so nothing can be read, or video...

tarikozcanX by Community Member
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Bit of a newbie question. We’re trying to set-up 2 CP.7841 phones with the Call Manager on a Cisco 4431 router. The phones are not registering on the router.  The router version is 16.9. The phone’s original firmware version was SIP78xx.12-0-1-11. We...

mvh4205 by Visitor
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  • 3 replies
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Hi all, I have an analog/SIP voice GW(Patton) with FXO port connected to public land line.On this analog GW, I have also analog sets connected to FXS ports.This GW is sip-connected to CUCM 12.5.1: on which I have hundreds of SIP phones  Questions: 1°...