Please take a look and see if I have a problem.
[general]
context=inbound-sip ; Default context for incoming calls
pedantic=no
nat=no
port=5060
bindport=5060
bindaddr=0.0.0.0
recordhistory=yes
disallow=all
allow=ulaw
allow=gsm
trustrpid=yes
dtmfmode=inband
relaxdtmf=yes
realm=asterisk
;
;; Gizmo
register => 17476464000:secret@proxy01.sipphone.com/1747*.*
;; Gizmo for Alex ;Direct Connection via Grand Central Numbers;;
register => 17476454102:secret@proxy01.sipphone.com/1747*.*
register => 17472619842:secret@proxy01.sipphone.com/1747*.*
register => 17472642135:secret@proxy01.sipphone.com/1747*.*
;; Viatalk Registration
register => 1260*.:mypassword@chicago-1e.vtnoc.net/1260.*
[viatalk]
type=peer
username=my number
fromuser=my number
authuser=my number
secret=my password
host=chicago-1e.vtnoc.net
fromdomain=chicago-1e.vtnoc.net
nat=no
qualify=yes
insecure=invite
dtmfmode=inband
dtmf=inband
disallow=all
allow=ulaw
context=inbound-sip
relaxdtmf=yes
[sipphone]
type=peer
secret=pass
username=gizmonumber
fromuser=gizmonumber
fromdomain=proxy01.sipphone.com
host=proxy01.sipphone.com
context=inbound-sip
disallow=all
allow=ulaw
allow=gsm
dtmfmode=rfc2833
insecure=invite
canreinvite=no
qualify=yes
;nat=yes
[3100]
type=friend
username=3100
secret=pass
host=dynamic
;auth=md5
callerid=“Berlin Slone” <3100>
context=home
mailbox=3100
reinvite=no
canreinvite=no
;nat=yes
disallow=all
allow=ulaw
allow=gsm
allow=speex
allow=h263
allow=h263p
dtmfmode=rfc2833
qualify=yes
[3101]
type=friend
username=3101
secret=pass
host=dynamic
;auth=md5
callerid=“Zonya Slone” <3101>
context=home
mailbox=3101
reinvite=no
canreinvite=no
;nat=yes
disallow=all
allow=ulaw
allow=gsm
allow=speex
allow=h263
allow=h263p
dtmfmode=rfc2833
qualify=yes
[3102]
type=friend
username=3102
secret=pass
host=dynamic
;auth=md5
callerid=“Andrew Slone” <3102>
context=home
mailbox=3102
reinvite=no
canreinvite=no
;nat=yes
disallow=all
allow=ulaw
allow=gsm
allow=speex
allow=h263
allow=h263p
dtmfmode=rfc2833
qualify=yes
[3103]
type=friend
username=3103
secret=pass
host=dynamic
;auth=md5
callerid=“Alex Slone” <3103>
context=home
mailbox=3103
reinvite=no
canreinvite=no
;nat=yes
disallow=all
allow=ulaw
allow=gsm
allow=speex
allow=h263
allow=h263p
dtmfmode=rfc2833
qualify=yes
[3104]
type=friend
username=3104
secret=pass
host=dynamic
;auth=md5
callerid=“Michael Slone” <3104>
context=home
mailbox=3104
reinvite=no
canreinvite=no
;nat=yes
disallow=all
allow=ulaw
allow=gsm
allow=speex
allow=h263
allow=h263p
dtmfmode=rfc2833
qualify=yes
[3105]
type=friend
username=3105
secret=pass
host=dynamic
;auth=md5
callerid=“Linksys Phone” <3105>
context=home
mailbox=3105
reinvite=no
canreinvite=no
nat=yes
disallow=all
allow=ulaw
allow=gsm
allow=speex
allow=h263
allow=h263p
dtmfmode=rfc2833
qualify=yes
[3106]
type=friend
username=3106
secret=pass
host=dynamic
;auth=md5
callerid=“Living Room” <3106>
context=home
mailbox=3106
reinvite=no
canreinvite=no
nat=yes
disallow=all
allow=ulaw
allow=gsm
;allow=speex
;allow=h263
;allow=h263p
dtmfmode=rfc2833
qualify=yes