Phone has no ctl file

As the phone upgrades, its firmware does not reset the phone during this process as it may lead to starting this process all over again. View our Cisco Collaboration courses. Note This basic reset sequence also works from any other screen that does not accept user input. Resets any user and network configuration changes that you have made but that the phone has not written to its flash memory to previously saved settings, then restarts the phone.

From the Settings menu, unlock phone options then press the Erase softkey. Resets user and network configuration settings to their default values, deletes the CTL file from the phone, and restarts the phone. From the Network Configuration menu, unlock phone options then press the Erase softkey.

Verify that the phone has registered. Verification of connectivity via packet capture. Packet Captures can be difficult to read when there is a lot going on, narrow it down the fields as much as possible with the following filters in Wireshark :.

Validate 2-way connectivity. The next thing to do is validate that there is two-way communication between the Cisco Unified Communications Manager and the phone. If there is none, then we can confirm there is no network connectivity.

Solution 3 — Validate File Downloadability. Verify that. Step 3. Step 4 To exit the Call Statistics screen, press the Back softkey.

Type of voice stream received RTP streaming audio : G. Type of voice stream transmitted RTP streaming audio : G.

Size of voice packets, in milliseconds, in the receiving voice stream RTP streaming audio. Note This number is not necessarily identical to the number of RTP voice packets received since the call began because the call might have been placed on hold. Note This number is not necessarily identical to the number of RTP voice packets transmitted since the call began because the call might have been placed on hold. Estimated average RTP packet jitter dynamic delay that a packet encounters when going through the network.

Number of RTP packets in the receiving voice stream that have been discarded bad packets, too late, and so on. Note The phone will discard payload type 19 comfort noise packets that are generated by Cisco Gateways, which will increment this counter. Score that is an objective estimate of the mean opinion score MOS for listening quality LQK that rates from 5 excellent to 1 bad.

This score is based on audible concealment events due to frame loss in the preceding 8-second interval of the voice stream. For more information, see the "Monitoring the Voice Quality of Calls" section on page Total number of concealment frames divided by total number of speech frames received from start of the voice stream. Ratio of concealment frames to speech frames in preceding 3-second interval of active speech.

If using voice activity detection VAD , a longer interval might be required to accumulate 3 seconds of active speech. Number of seconds that have concealment events lost frames from the start of the voice stream includes severely concealed seconds.

Number of seconds that have more than 5 percent concealment events lost frames from the start of the voice stream. The firmware version name is in this format:. Version Number. Table explains the information that is displayed on this screen.

Step 2 Select Firmware Versions. To view one of the items, scroll to the item and press Select. Step 3 To exit the Firmware Versions screen, press Back. Download this chapter. Table Call Statistics Items Item.

Table Firmware Version Information Item. Indicates web access capability for the phone. CallManager Information. Network Information.

Name of the DNS in which the phone resides. IP address for the default gateway used by the phone. WLAN Information. Name of the network profile that the phone is currently using. Service Set ID that the phone is currently using.

Wireless signal mode that the phone is currently using. Encryption method that the phone is currently using in the wireless network. HTTP Information. CUCM Version 8. This section provides a quick overview of exactly what SBD provides.

This file allows the phone to verify that the configuration file came from a trusted source. The file is plain text on the network while it is transmitted, but comes with a special verification signature. The signed file has a signature at the top in order to authenticate the file, but is otherwise in plain text XML. Signature verification reverses this process through the use of the public key that matches in order to decrypt the hash. If the hashes match, it shows:. If optional TFTP configuration encryption is enabled in the associated Phone Security Profile, the phone requests an encrypted configuration file.

The encrypted configuration file has the signature at the beginning as well, but there is no plain text data after, only encrypted data garbled binary characters in this text editor. The image shows that the signer is the same as in the previous example, so this signer must be present in the ITL file before the phone accepts the file.

Further, the decryption keys must be correct before the phone can read the contents of the file. IP phones contain a limited amount of memory, and there can also be a large number of phones to manage in a network.

This central trust store is easier to manage than if the trust store was present on all IP phones. First, there are a number of files that must be present on the CUCM server itself. The image shows that the CallManager. All TFTP configuration files are signed by the private key below. In addition to the CallManager. This section breaks down the ITL file piece-by-piece, because it has a number of important components that the phone uses.

The first portion is the signature information. Even the ITL file is a signed file. The next sections each contain their purpose inside of a special Function parameter. The first function is the System Administrator Security Token.

This is the signature of the TFTP public key.