[VoiceOps] Audio latency in DC area, Part 2

[David Hiers]

Thanks for the feedback!!!

David



On Thu, Oct 6, 2011 at 6:54 AM, Jon Schnelz <jschnelz at enterprisepcs.com> wrote:
> Hey David have you tested the following scenarios:
>
> 1) Out of area Cell phone roams into the affected market(s)
> 2) Assigning a Wash DC DID to a phone in your PDX market and testing with a
> PDX cell phone.
>
> In the first case the out of area phone will use a TLDN that is typically a
> non-cellular DID (it is typically part of the wireline network for the
> wireless carrier).
>
> The second scenario should remove the local market handoff between the cell
> carriers and level3. You might also try a Wash DC assigned cell phone used
> in PDX to the Wash DC DID.
>
> We had a similar problem with Nextel phones to Level3 DID's which turned out
> to be a SIP trunk issue between Sprint and Level3 (it was on Sprint's side).
> We had to get Level3 to open a ticket with Sprint for testing. Since this is
> all carriers, it points to a Level3 issue (if they are L3 DID's on your VOIP
> phones)
>
> Jon Schnelz
>
> Message: 4
> Date: Thu, 6 Oct 2011 06:30:32 -0700
> From: David Hiers <hiersd at gmail.com>
> To: VoiceOps at voiceops.org
> Subject: [VoiceOps] Audio latency in DC area, Part 2
> Message-ID:
>        <CANpkwCZ2ZxzLVmN4aOhW2pr4Rf403KpHoKxtB7KgUD3_gvVadg at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi folks,
>
> I want to send out another shout regarding an on-going issue in the DC area.
> We've got excessive audio delay between our voip phones and cell phones.
> Packet specs (loss, jitter, etc) are fine, ping times for everything rock.
>
> Specifically, these rate centers are involved:
>
> DALE CITY
> HERNDON
> MANASSAS
> WSNGTNZN08
> WSNGTNZN17
>
> but NOT this nearby one:
>
> TRIANGLE
>
> Here are some of the voip NPA/NXXs involved:
>
> 703647
> 703880
> 703508
> 703647
> 240283
>
> The issue affects any cell in the area.  All our test calls are local; the
> cell phone is in the same building as the voip phone.
> The cell phone has and has strong signal.
>
> We've measured audio latency of up to 550ms; it is just impossible to hold a
> conversation.
>
>
> In all cases:
>
> 1. VOIP-to-CELL calls are slower than CELL-to-VOIP 2. 3G is slower than GSM
> 3. PSTN-VOIP calls are good 4. PSTN-CELL calls are good
> 5  Only VOIP-CELL calls are bad
>
> Anyone got any issues in the DC area?  Would your users report this kind of
> problem?  The DC area comes in near the bottom of the list on most of the
> "bad cell phone area" studies, so most cell users there have had tolerance
> of this sort of thing beat into them over the years.
>
>
> Thanks,
>
> David
>
>
> ------------------------------