On Tue, Jun 21, 2011 at 4:28 PM, Alex Brown <[email protected]> wrote: > On 6/12/2011 8:12 PM, Tony Graziano wrote: > >> >> Network (most likely). >> >> >> 2. Describe your connectivity better. Are you using sip >> trunks? > > Well, I do use SIP trunks for the long distance calls but the local > calls are routed through an AudioCodes MP-118 Gateway. > > >> It is most likely a network traffic issue. I suspect you are >> using sip trunks. It is also likely you do not have adequate >> traffic shaping/prioritization measures in place at your >> firewall. > > I believe there is adequate traffic shaping configured on the Cisco > router. The main problem is that this issue (callers hearing glitches > or dropped syllables from recipients but recipients hearing callers just > fine) occurs even between phones on the same internal LAN. So, the > router and the AudioCodes Gateway are not always a part of the scenario > when users experience this problem. > Does the LAN have qos prioritization and is it on a separate vlan from the data network (best practice). >> >> You can hear them (download) but they have problems hearing >> you (upload) which is "typical" with cable modem/dsl and >> assymetric internet connections unless shaping is properly >> addressed. > > I recently read another thread about a user hearing a stutter during > voicemail IVR playback. One of my users has experienced that same issue > and you indicated that it might be a problem with the Polycom firmware. > I'm currently running the version 3.2.4 but I have deactivated that > and reactivated 3.1.3RevC so hopefully that will help to resolve the > issue. I have QoS configured on all of the switches and a user has told > me that the call quality on Skype is better than the quality on the > Polycom phones so I'm hoping/thinking that it may be the firmware.
I don't see these issues, but I have qos and voip sits on own vlan. I'd consider going back to 3.2.5 firmware. I don't have the stutter at the beginning of the VM but I'm running on today's stable release. > > I know there are many tests I can run but what are some of the best > tools/tests to run in order to track down the cause of an issue like > this? Should I look into setting up an RTCP-XR collector for Polycom > Productivity Suite? We don't have the Polycom Productivity Suite but > should we get it? Will one suite license cover all of the 64 phones we > have? > I think before I'd consider that level of data collection, I'd make sure the voip was insulated from everything else (vlan/qos). > > Thanks again for your help. > > > _______________________________________________ > sipx-users mailing list > [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-users/ > -- ====================== Tony Graziano, Manager Telephone: 434.984.8430 sip: [email protected] Fax: 434.326.5325 Email: [email protected] LAN/Telephony/Security and Control Systems Helpdesk: Telephone: 434.984.8426 sip: [email protected] Helpdesk Contract Customers: http://support.myitdepartment.net Blog: http://blog.myitdepartment.net Linked-In Profile: http://www.linkedin.com/pub/tony-graziano/14/4a6/7a4 _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users/
