IP Telephony and Phones

I need to understand the usage of voice codec: what i know the analog line bandwidth is 64 kbps when iam using g711ulaw codec for example or g792 it's will compress the voice traffic to 8 kbps is that mean 1 analog line can handle 8 calls in one time...

Hello Dears,   I have CME Version 12.0. All phones register without issues except one 8811 sip phone, it was working fine. After that i move it to another office it stopped working and show message "Telephony Service Unavailable". kindly find the con...

Hi All We have a Call Manager express with a SIP trunk to the provider, currently the SIP flows through the Firewall and is Natted. Can anyone tell me if it is best practice when using SIP to plug the ISP connection straight into the Call Manager and...

I am running into an issue with the 8861 phones we have. When you dial off hook there is a 10-15 second delay in the call going out. I have adjusted the t302 timer to the lowest value and that helped a little but we are still seeing the delay. Howeve...

Hello We have ordered a few 8851 cisco phones and just short of half the Data jack jumpers going to the computer is loose and loses connectivity. any movement of the phone causes connectivity issues to the computer. and telling people to gently s...

Hi We have VoiceGateway with E1 line. Problem we are facing with Voice gateway is, pots and voip dial-peer commands are disappearing after we upgrade. Our operate process is : firstly, we downgrade from the 03.16.05.S.155-3.S5 to 03.15.04.S.155-2.S4,...

Hi All, I need some help here regarding a 7961G IP phone. I tried to convert the phone from SCCP to SIP. However, when I factory reset the phone, the phone kept sending request to the DHCP server. When DHCP server proposed an IP address to it, the ph...

Hi all, This is for CCIE-Collaboration written exam preparation. We need to troubleshoot SIP messages interpretation among UC components like b/w Cisco CUCM to Cisco IM/presence OR Cisco CUCM-Unity etc. Can anybody advise any great book or learning r...

Hello; Is it possible to route the incoming call (at the voice gateway) to certain phone extension based on the caller id? How?   For example: If the caller id were 71113391 or 03112233 then the incoming call to this voice gateway to be sent for phon...

Hello all, I am trying to setup meet-me in CME for conference calls. This is my dspfarm config.   dspfarm profile 1 conferencecodec g729br8codec g729r8codec g729abr8codec g729ar8codec g711alawcodec g711ulawmaximum conference-participants 16maximum se...

Hello,   Want to know if there are any tools with which we can monitor voice quality, and also generate a weekly/monthly report.  We do have tools to check network stability, is there any similar tool available to check the quality of VoIP calls.