IP Telephony and Phones

We are thinking of using CME4.1 as a gateway to a SIP trunk out (384K).The questions we have:Does the connection to the PBX (VWIC) need to be configured as a SIP?The SIP trunk out is only for connecting the sites (a SIP server by the providor is resp...

Hi all i am using VOIP solution in a campus lan environment where all the VOIP Phones have EPBX as thier Gateway,and the EPBX is connected to PSTN for dialling outside,I have Public IP natted for the EPBX Gateway,can i use this Public IP any means in...

We have an office setup on CME that is looking to save cost by using a 3rd party 'call through' service providers. Meaning they dialing a number, wait, dial the number they wish to call and press #. We are using ISDN PRI at this location so I think...

Want to change firmware type for my 7912G. It is based on SIP image CP7912010301SIP050608AVersion 1.3.1(050608A)Can I convert it to SCCP CP7912080004SCCP080108A.sbin which is the latest version?Many thanks. I've spent more than 4 hours reading and te...

Good morning, would want to receive, if possible, information on as to configure the telephones IP Mod. 3911. I know that it is necessary to send a file of configuration to the telephones in formed XML, through a server TFTP. We in firm don't have a ...

What is defference about unicast and multicast MoH?

We are looking for an ISDN-BRI-Gateway with 2 or more S0-Ports that could be connected via H323 or MGCP to a UCM (Callmanager) System (6.1). We need this gateway for PCs with an ISDN-Card to call different applications over ISDN. Unfortunately we hav...

There are one CISCO2821 and one CISCO3845. Both of them are configured with SRTP. They can make calls to the third-party phone with SRTP. But both gateways can not accept any call if I set them to use SRTP only. Even if the 2 gateways call each oth...

Does anyone know of a website or list, of security vulnerabilities specific to call manager. We are running call manager 6.0 and I am wondering if there are any security vulnerabilities that i should be aware of. I would also like the same info for...

Hi : I have a CCM and version is 5.1 , I found I always can not open the web site of CCM when the server work about one month, but I can ping the address of CCM and the ip phone is ok, if I restart the CCM server then I can access the web site,why ?

Hello, we have an issue with a reception phone that has 5 lines attached to it. The plan is for lines 2001-2004 to ring and forward to the next if busy. If all are busy, it should forward to voice mail on 2000.However, the problem is today customer's...

CUCM 6.1(1a)I've got a handful of 7940/7960 phones that I put the DND (do-not-disturb) softkey on. Works good. However, for some reason when the user hits the DND button on the phone to enable it, the phone displays the word "UNDEFINED!" on the scr...

who can inform me how to config pax in the environment of VG224 and CCM5.1.I knew VG224 with 12.4(11) can support Fax Realy, and I have configed only SCCP between VG224 and CCM5.1, any more configuraion for fax needed?

We provide enterprise VOIP to a group of customers with our Callmanagers located at two Network Operations Centers. We are in an IP only environment (no PBXs, gateways, etc). Both NOCs and Callmanagers reside behind a firewall. All sites connect t...

There are 6 switches in LAN. All of them are cisco 3560. There are three vlans. Vlan 35 is for data vlan. Vlan 36 is for phone vlan. Vlan 38 is for CCM vlan. Recently, we found there are many packages lost between IP Phone in LAN. I monitored all int...