I seem to have sip signaling without any problem. I can make calls from asterisk through Google Voice… I can receive calls from Google Voice # through gtalk to asterisk no problem. But the only problem is there is no audio on either end of the call no matter what the scenario is. I have everything setup as suggested using ulaw. As far as asterisk is concerned, the calls work fine with no errors. Only problem is no audio. So I’m kind of at my wits end with this one.
I’ve replaced my user credentials with dummy info but the rest is as is… Any help and guidance would be much apprecaited. I know i’m so close as everything works just not the audio 
extensions.conf
[local]
;This i found odd that i had to do to get it to answer the call. I’m new to figuring out these dialplans so I may be overlooking something
exten => mygmailuser@gmail.com,1,Dial(SIP/dave1,20,D(:1))
;Doesn’t end up doing anything…
exten => s,1,Set(name=${CALLERID(name)})
exten => s,n,Set(name=${CALLERID(name)})
exten => s,n,Set(num=${CUT(name,@,1)})
exten => s,n,Set(CALLERID(all)=${num})
exten => 100,1,Dial(gtalk/asterisk/myothergmailaccount@gmail.com)
;Route all outbound calls through Google Voice gtalk/jabber connection
exten => _1XXXXXXXXXX,1,Dial(gtalk/asterisk/+${EXTEN}@voice.google.com)
jabber.conf
[general]
autoregister=yes ; Auto register users from buddy list.
auth_policy=accept ; Auto accept users’ subscription requests (default).
[asterisk]
type=client ; Client or Component connection
serverhost=talk.google.com ; Route to server for example, talk.google.com
username=mygmailuser@gmail.com/Talk ; Username with optional resource.
secret=mypassword
port=5222 ; Port to use defaults to 5222
usetls=yes ; Use tls or not
usesasl=yes ; Use sasl or not
statusmessage="I am an Asterisk Server"
timeout=100
gtalk.conf
[general]
context=local
bindaddr=0.0.0.0; Address to bind to
nat=yes
allowguest=yes ; Allow calls from people not in list of peers
disallow=all
allow=ulaw
[guest]
disallow=all
allow=ulaw
context=local
connection=asterisk
