asterisk users - Oct 2005 - IP300 -> Asterisk -> Broadvoice -> PSTN Choppy / cuts in and out

Hello All -
 I've got an asterisk setup using 3 broadvoice lines and 5 Polycom IP300
phones. We have 1.5Mbit up and down via cable. 40ms (ave) pings to the
broadvoice proxy and no packetloss.
 The phones sound like cell phones. The person on the other end complains
about it cutting in and out. On our end, it cuts in and out as well.
 Within the office, we can call from one IP300 to another with absolutely no
problems at all. Sounds great.
 We are connected through a Linksys (Firmware v1.05.0). Wired QoS is enabled
with the asterisk box's mac being highest priority, and everything else
being low. Upstream bandwidth is set to Auto. [I doubt these settings are
the problem as the choppy/cell-phone-sounding effect also occurs when there
is minimal network traffic.]
 Any help troubleshooting this plz?
  Snippets from sip.conf:
[210]
username=210
type=friend
secret=*******
record_out=On-Demand
record_in=On-Demand
qualify=no
port=5060
nat=never
mailbox=210@default
host=dynamic
dtmfmode=rfc2833
context=from-internal-bbp
canreinvite=no
callerid="Mike" <210>
 [bbpbv1]
username=949743####
user=phone
type=peer
secret=**********
nat=yes
insecure=very
host=sip.broadvoice.com <http://sip.broadvoice.com>
fromuser=949743####
fromdomain=sip.broadvoice.com <http://sip.broadvoice.com>
dtmfmode=inband
context=from-bbp-pstn
canreinvite=no
authname=949743####
 [949743####]
username=949743####
user=949743####
type=user
nat=yes
insecure=very
host=sip.broadvoice.com <http://sip.broadvoice.com>
fromdomain=sip.broadvoice.com <http://sip.broadvoice.com>
dtmfmode=inband
dtmf=inband
context=from-bbp-pstn
  Test call:
# asterisk -vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvrx "sip show channels"
Peer User/ANR Call ID Seq (Tx/Rx) Format
147.135.8.128 <http://147.135.8.128> 1949##### 5855b260439 00103/00000
ulaw
192.168.1.100 <http://192.168.1.100> 210 f8c9ee5e-9f 00101/00002 ulaw
2 active SIP channel(s)
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