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Cisco SPA112

posted Mar 29, 2016, 7:36 PM by Leszek Pilat   [ updated Mar 29, 2016, 7:39 PM ]

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Cisco SPA112 2-Port Phone Adapter

Issues can occur with fax transmissions over IP networks, even with the T.38 standard, which is supported by the ATA. You can adjust several settings on your ATA to optimize your fax completion rates.

STEP 1: Ensure that you have enough bandwidth for the uplink and the downlink.
For G.711 fallback, it is recommend to have approximately 100 kbps.
For T.38, allocate at least 50 kbps.

STEP 2: Click Voice in the menu bar, and then click Line 1 or Line 2 in the navigation tree.

STEP 3: In the Network Settings section, enter the following settings:

Network Jitter Level: very high
Jitter Buffer Adjustment: no

STEP 4: In the Supplementary Service Subscription section, enter the following settings:

Call Waiting Serv: no
Three Way Call Serv: no

STEP 5: In the Audio Configuration section, enter the following settings to support T.38 fax:

Preferred Codec: G.711u (USA) or G.711a (rest of the world)
Use pref. codec only: yes
Silence Supp Enable: no
Echo Canc Enable: no
FAX Passthru method REINVITE
FAX Enable T38: Yes
FAX T38 ECM Enable: Yes
Fax Tone Detect Mode: Callee only

To remind firewalls to keep the connection between the adapter and our service, we recommend:

redirect-keepalive yes

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Resetting or Restarting the Cisco Unified IP Phone 7975

posted Oct 11, 2013, 8:50 AM by Leszek Pilat   [ updated Sep 12, 2014, 8:10 PM ]

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1.Performing a Basic Restart

Restart phone
From the Main screen, press Settings to displays the Settings menu, then press **#**.
Note This basic reset sequence also works from any other screen that does not accept user input. 

2.Performing a Factory Reset

Performing a Factory Reset
When you perform a factory reset of the Cisco Unified IP Phone, the following information is erased or reset to its default value:
-CTL file—Erased
-LSC—Erased
-User configuration settings—Reset to default values
-Network configuration settings—Reset to default values
-Call histories—Erased
-Locale information—Reset to default values
-Phone application—Erased (phone recovers by loading the term75.default.loads file)
Before you perform a factory reset, ensure that the following conditions are met:
-The phone must be on a DHCP-enabled network.
-A valid TFTP server must be set in DCHP option 150 or option 66 on the DHCP server.
-The term75.default.loads file and the files specified in that file should be available on the TFTP server that is specified by the DHCP packet.

To perform a factory reset of a phone, perform the following steps:
Step 1 Unplug the power cable from the phone and then plug it back in.
The phone begins its power-up cycle.
Step 2 While the phone is powering up, and before the Speaker button flashes on and off, press and hold #.
Continue to hold # until each line button flashes on and off in sequence in orange.
Step 3 Release # and press 123456789*0#.
You can press a key twice in a row, but if you press the keys out of sequence, the factory reset will not take place.
After you press these keys, the line buttons on the phone flash orange and then green, and the phone goes through the factory reset process. This process can take several minutes.
Do not power down the phone until it completes the factory reset process, and the main screen displays.



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Setting Up a CentOS / Red Hat Linux DHCP Client

posted Oct 8, 2013, 8:23 AM by Leszek Pilat   [ updated Aug 18, 2014, 6:51 PM ]

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First backup existing network configuration file using cp command:
# cp /etc/sysconfig/network-scripts/ifcfg-eth0 /root/ifcfg-eth0.bak

Configuring a DHCP Client

Setting up a Linux for dhcp can be done by editing file using a text editor such as vi:
# vi /etc/sysconfig/network-scripts/ifcfg-eth0

Following is sample static configuration:
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:FF:FF:FF:FF:FF
IPADDR=10.10.0.6
NETMASK=255.255.255.0
GATEWAY=10.10.0.1
ONBOOT=yes


Replace static configuration with DHCP:
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:FF:FF:FF:FF:FF
ONBOOT=yes

Save and close the file. Restart network service:
# /etc/init.d/network restart



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ELASTIX/ASTERISK ver. 11.5 and CISCO IP Phone 7975 SIP registration problem

posted Oct 6, 2013, 2:09 PM by Leszek Pilat   [ updated Aug 18, 2014, 6:53 PM ]

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Downgrade Asterisk from ver 11.5 to ver 11.4

yum downgrade asterisk


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cdr_mysql.c my_load_module: Unable to query table description!!

posted Oct 6, 2013, 2:06 PM by Leszek Pilat   [ updated Aug 18, 2014, 6:53 PM ]

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cdr_mysql.c my_load_module: Unable to query table description!!

cdr_mysql.c: Unable to query table description!! Logging disabled.


# service asterisk stop
# service mysqld stop
# mysql -u root -p
>repair table asteriskcdrdb.cdr;
>exit

# service mysqld start
# service asterisk start
# asterisk -rvvv


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