[YMCS/YDMP Free Trial Program]Yealink would like to offer Free Trial Program of Yealink device management service for our current eligible customers. You can see the details below.
https://www.yealink.com/ydmp-freetrial-2020


Post Reply 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
T48G Adding 175ms to outbound audio
Author Message
tyfrantz@gmail.com Offline
Junior Member
**

Posts: 2
Joined: Sep 2015
Reputation: 0
Post: #1
T48G Adding 175ms to outbound audio
I am testing several phones for an eventual 3cx deployment. The three phones I'm testing right now include: Cisco SPA 303, Yealink T20P, and a Yealink T48g (firmware 35.73.0.50).

I love the T48G. It's affordable, it's fast, I love the dss keys, the flexibility, the interface, I love it all. However, upon extensive testing I have definitively identified that it is adding on the order of 175ms delay on outbound audio.

I have two versions of 3cx running: one is hosted in Seattle through 3cxhost.com and the other is a local install on my LAN on one of my servers. I have the phones registered to both servers. In order to test latency I record finger snaps using Audacity and then I can quickly measure the distance between the sound waves and be very precise in my figures. Because latency is my biggest concern with this deployment, I have done extensive testing. My tests include extension to extension calling using the hosted server and the server on my LAN. While connected from extension to extension, I would mute one phone and would snap in the other recording both my finger snap and the sound on the other extension using an external microphone. My results were not impacted based on who called who first (ie ext 1 -> ext 2 vs ext 2 -> 1 didn't matter, which would have shocked me if it did). In the results below, I have obviously averaged because they weren't all EXACTLY the PRECISE same number of milliseconds, however if they were within 20 ms then I made them the same. Here are the results:

Hosted Server
SPA -> T20: 165ms
T20 -> SPA: 165ms
T48g -> T20: 165ms
T48g -> SPA: 165ms
T20 -> T48G: 340ms
SPA -> T48g: 340ms

LAN Server
SPA -> T20: 45ms
T20 -> SPA: 45ms
T48g -> T20: 45ms
T48g -> SPA: 45ms
T20 -> T48G: 220ms
SPA -> T48g: 220ms

This is using the G711 on the t48. I tried some of the other codecs and didn't have any results that differed substantially from the above. At least, I think I tried others. I moved some of them up on the list in the phone settings, and then eventually removed all codecs but the one I wanted to try, and so I assume that forces it to use the remaining codec.

Conclusion/Problem/Question: Why is the T48g adding 175ms to outbound audio?????? I really like this phone but I'm trying to shave down latency and working my butt off to do that and the T48 is kicking me in the teeth!

Thanks,
Tyson
(This post was last modified: 09-22-2015 05:03 AM by tyfrantz@gmail.com.)
09-22-2015 04:51 AM
Find all posts by this user    like0    dislike0 Quote this message in a reply
Post Reply 


Messages In This Thread
T48G Adding 175ms to outbound audio - tyfrantz@gmail.com - 09-22-2015 04:51 AM

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  T48G/T49G on Ring Central? Gordon 2 9,283 12-27-2023 10:38 AM
Last Post: jseeley
  T48G Top row keypad buttons requiring too much pressure after time Chris708 4 9,823 11-16-2023 01:08 AM
Last Post: here4real
  T48G Connected handset not answering or ending call with connected handset. Pettis 4 2,326 07-27-2023 05:38 AM
Last Post: Lissvazquez
  T48G + EHS36 +Janra engage 75 not hanging up call kris.hetherington@firstsource.com 1 5,204 09-30-2022 03:23 AM
Last Post: knewgent
  T48G - TLS 1.2 Support for 3CX Futureweb 1 2,511 09-30-2022 12:55 AM
Last Post: complex1
Sad T46S: small and severe audio interruptions ronald.swaypc 0 1,914 04-05-2022 08:57 PM
Last Post: ronald.swaypc
  T48s setting outbound caller ID thunderzhao 1 5,045 09-10-2021 04:08 PM
Last Post: complex1
  T41P/T48G/T58V IPv6 SIP Issues ReubenFarrelly 22 63,167 08-01-2021 06:14 PM
Last Post: Phil2021
Question T48G + WH66 Futureweb 1 4,247 06-09-2021 09:22 PM
Last Post: Futureweb
  T46G/T48G no Ringtone because of 183 insted of ringing eurix 2 6,843 04-09-2021 05:16 PM
Last Post: eurix

Forum Jump:


User(s) browsing this thread: 1 Guest(s)

Contact Us   Yealink   Return to Top   Return to Content   Lite (Archive) Mode   RSS Syndication