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
