I am currently having a voice quality problem with one of our Asterisk servers. We have checked the network and we have found no problems that could cause the voice to sound cracked and with small interruptions. I am looking at the timing source for Asterisk and it is currently using timerfd even though we have an E1 card installed. Is timerfd better than dahdi? Any recommendations to test if timing may be a problem for voice quality and DTMF? -- Telecomunicaciones Abiertas de M?xico S.A. de C.V. Carlos Ch?vez +52 (55)9116-91161
Carlos Chavez wrote:> I am currently having a voice quality problem with one of our Asterisk > servers. We have checked the network and we have found no problems that > could cause the voice to sound cracked and with small interruptions. I > am looking at the timing source for Asterisk and it is currently using > timerfd even though we have an E1 card installed. Is timerfd better than > dahdi? Any recommendations to test if timing may be a problem for voice > quality and DTMF?What is the scenario and the channels involved? Timing is only used for things such as playback, music on hold, and ConfBridge. If it's strictly a two party call then Asterisk forwards media as received. -- Joshua Colp Digium, Inc. | Senior Software Developer 445 Jan Davis Drive NW - Huntsville, AL 35806 - US Check us out at: www.digium.com & www.asterisk.org
On 4/5/16 3:17 PM, Joshua Colp wrote:> Carlos Chavez wrote: >> I am currently having a voice quality problem with one of our Asterisk >> servers. We have checked the network and we have found no problems that >> could cause the voice to sound cracked and with small interruptions. I >> am looking at the timing source for Asterisk and it is currently using >> timerfd even though we have an E1 card installed. Is timerfd better than >> dahdi? Any recommendations to test if timing may be a problem for voice >> quality and DTMF? > > What is the scenario and the channels involved? Timing is only used > for things such as playback, music on hold, and ConfBridge. If it's > strictly a two party call then Asterisk forwards media as received. >The problem appears on all calls, no matter the source or destination. There are desk phones, softphones and a couple SIP trunks to another office. They all experience the problem. Calls between extensions, from or to the E1, from or to trunks. The only scenario left to try is connecting calls only via the E1 so we completely eliminate the network side of things and se if we get the same behaviour. During calls you can hear some background noice and interruptions in the voice. DTMF fails when we try to dial to external IVR. I do not really believe that the fault is in the Asterisk server but I have to eliminate all posibilities on my side before I can lay blame on the network infrastructure. I was also just wondering if DAHDI would not be a better timing source for Asterisk since it is hardware based? -- Telecomunicaciones Abiertas de M?xico S.A. de C.V. Carlos Ch?vez +52 (55)9116-91161
On 4/5/16 3:17 PM, Joshua Colp wrote:> Carlos Chavez wrote: >> I am currently having a voice quality problem with one of our Asterisk >> servers. We have checked the network and we have found no problems that >> could cause the voice to sound cracked and with small interruptions. I >> am looking at the timing source for Asterisk and it is currently using >> timerfd even though we have an E1 card installed. Is timerfd better than >> dahdi? Any recommendations to test if timing may be a problem for voice >> quality and DTMF? > > What is the scenario and the channels involved? Timing is only used > for things such as playback, music on hold, and ConfBridge. If it's > strictly a two party call then Asterisk forwards media as received. >I am starting to think that the problem may be in the server hardware itself. We are using a Dell R220 with 8gb of ram and 2 hard disks in a Raid 1 configuration (Linux Raid). We are using CentOS 7. We had to remove the raid card from the server to install an E1 card (the raid card was Windows only so no loss there really). Internally everything sounds good (from E1 to a conference or music) but once you hit a network interface we start getting pops and drops. Anyone with this server and Asterisk ever had issues like these? -- Telecomunicaciones Abiertas de M?xico S.A. de C.V. Carlos Ch?vez +52 (55)9116-91161