Cisco 7931 Phone and Headset

The Cisco Unified IP Phone 7931 includes 24 buttons that can be assigned to lines and call features. A 3-color LED provides call status information for each line. The line buttons are numbered 24-1 from top to bottom. The numbers do not appear on the phone. There are two ways how the top four buttons can be programmed. enable configure terminal ephone template 15 button-layout set phone-type [1 | 2]** exit ephone 3 ephone-template 15 end ** Specifies which fixed set of feature buttons appears on a Cisco Unified IP Phone 7931G that uses a template in which this is … Continue reading Cisco 7931 Phone and Headset

DSP, PVDM & Media Resources

The Cisco High-Density Packet Voice Digital Signal Processor (DSP) Module (PVDM2) enables Cisco Integrated Services Routers to provide high-density voice connectivity, conferencing, and transcoding capabilities in Cisco IP Communications solutions. PVDM stands for packet voice DSP module; it is the Cisco product name for the module that provides digital signal processing resources to a system. DSP stands for Digital Signal Processor; it is a generic Industry terminology. A PVDM module could be staffed with one or multiple DSPs. PVDM2-8 = 8ch (G), 4ch (H), 4ch (M) PVDM2-16 = 16ch (G), 6ch (H), 8ch (M) PVDM2-32 = 32ch (G), 12ch (H), … Continue reading DSP, PVDM & Media Resources

Restricting Access to Corporate & Personal Directory

How you can restrict access to corporate directory? If you remember, corporate directory is accessible globally from a cluster and restricting its access needs some configuration changes. In pre-CUCM 7.x you cannot accommodate it at individual level but in CUCM7.x you have flexibility. You can run a sql command to access corporate directory information from ‘enduser’ table. admin:run sql select userid,firstname,lastname,telephonenumber from enduser userid firstname lastname telephonenumber ====== ========= ======== =============== hqph1            hqph1 hqph2            hqph2 br1ph1           br1ph1 br1ph2           br1ph2 JTAPI            JTAPI In Pre-CUCM 7.x build you can disable corporate directory by following these steps: Go to Enterprise parameters and go … Continue reading Restricting Access to Corporate & Personal Directory

Scenario#23 – Fax Issues for ATA

Fax machines connected to ATA were not working. The first thing I checked on the gateway…is fax-relay was being used or fax protocol cisco was configured? Fax-relay is NOT supported by ATA. This is what I found at the Voice gateway: voice service voip allow-connections h323 to sip allow-connections sip to h323 allow-connections sip to sip supplementary-service h450.12 fax protocol cisco I found the reason why faxes were not working. Fax protocol cisco was used which enabled default fax-relay. I configured the following: voice service voip fax protocol none {or could have configured modem passthrough nse codec g711ulaw} dial-peer voice … Continue reading Scenario#23 – Fax Issues for ATA

IOS 15.1 Toll Fraud feature

A new feature has been introduced in Cisco IOS® Software Release 15.1(2)T to guard against the incidence of toll-fraud on Voice GateWays (VGWs) installed with Cisco IOS. Starting with IOS 15.1(2)T and newer releases of IOS based on this version, the toll-fraud prevention settings are the default behavior of Cisco IOS-based VGWs. Behavior Before 15.1(2)T For all IOS releases before 15.1(2)T, the default behavior for IOS voice gateways is to accept call setups from all sources. As long as voice services are running on the router, the default configuration will treat a call setup from any source IP address as … Continue reading IOS 15.1 Toll Fraud feature

Scenario#22 – ISDN user busy 0x8091

This was an interesting scenario where incoming calls were getting ‘user busy’ message at the gateway and an engage tone was heard at calling party side. *Aug 18 08:36:53.581: ISDN Se0/0/0:15 Q931: RX <-CALL_PROC pd = 8  callref = 0x8D7E Channel ID i = 0xA9839E Exclusive, Channel 30 *Aug 18 08:36:54.997: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0x8D7E Cause i = 0x8091 -User busy It was not just one extension but several extensions which were having the same issue. They were all running fine till yesterday! Something must have happened… I did debug voip ccapi … Continue reading Scenario#22 – ISDN user busy 0x8091

License Re-homing

I came across this customer where we upgraded their CUCM from 6.x to 7.x and changed the mother board of the UCS Server (there were some issues with it). After the upgrade the Call manager had major Licensing issues as the MAC address got changed. All the units went into negative and there was an error in red saying Call manager is running out of license blah blah.. There is a process of re-homing your license if the MAC address has been changed. One way could be to send any of the previous license files to Cisco licensing licensing@cisco.com asking … Continue reading License Re-homing