Hi, 
I have problem with  my pbx and  Gigaset C610 IP Phone on internal number 71.

If the incoming call coming to the phone Number 41712345670 and the call ist 
forwarded to internal numbers as parallel call included internal number 71  
after 16 second there is the problem with only one way voice, the caller can’t 
hear the person on the extensions 71. But If the call coming direct to this 
extension 41712345671 there is no audio problem both person can hear each 
other. 

I have testet this with a snom 300 Phone and there is no one way audio problem. 
The Gigaset phone don't have gsm codes and on pbx i have disabled gsm codec
I have tested if I disable transfer message, after disable transfer message 
there is no problem with one way voice 
;exten =>70,n,Playback(transfer)  

I have tried transfer message with ulaw, alaw and gsm codec all the same 
problem i can hear the message but after transfer there is only one way audio.

has anyone ideaa what can I try to fix that?

In my SIP.Conf i have

[general]
useragent=MYPBX2SG
port=5060   
context = from-sip-external; send unknown sip callers to this context
alwaysauthreject=yes
deny = 0.0.0.0/0.0.0.0
permit = 192.168.1.0/255.255.255.0
allowguest=no
language=de
disallow=all 
allow=ulaw
allow=alaw
maxexpiry=120
defaultexpiry=50
qualify=2000
srvlookup=yes
nat=yes
allowsubscribe = yes
subscribecontext = hints

[41712345670]
type=peer
username=41712345670
secret=xxxxxx
fromuser=41712345670
host=siphost.ch
fromdomain=sipdomain.ch
canreinvite=no
insecure=port,invite
disallow=all
allow=alaw
allow=ulaw
allow=gsm
context=incominmygsipprovider
dtmfmode=info

[41712345671]
type=peer
username=41712345671
secret=xxxxxx
fromuser=41712345671
host=siphost.ch
fromdomain=sipdomain.ch
canreinvite=no
insecure=port,invite
disallow=all
allow=alaw
allow=ulaw
allow=gsm
context=incominmygsipprovider
dtmfmode=info

[70]
type=friend
username=70
secret=xxxxx
callerid="70" <70>
host=dynamic
mailbox=70@default
dtmfmode=info
canreinvite=no
insecure=port,invite
context=70
disallow=all 
allow=ulaw
allow=alaw
callgroup=2
pickupgroup=2
notifyringing=yes
callcounter=yes
limitonpeers = yes

[71]
type=friend
username=71
secret=xxxxx
callerid="71" <71>
host=dynamic
mailbox=70@default
dtmfmode=info
canreinvite=no
insecure=port,invite
context=71
disallow=all 
allow=ulaw
allow=alaw
callgroup=2
pickupgroup=2
notifyringing=yes
callcounter=yes
limitonpeers = yes

in my Extensions.conf I have 

[incomingmysipprovider]
exten => 41712345670,1,Dial(local/70@70)
exten => 41712345671,1,Dial(local/71@71)

exten =>70,1,Dial(SIP/70,16,r)
exten =>70,n,Playback(transfer)
exten 
=>70,n,Dial(SIP/71&SIP/72&SIP/73&SIP/74&SIP/75&SIP/76&SIP/77&SIP/78&SIP/79,13,r)
exten =>70,n,Playback(vm-nobodyavail) 
exten =>70,n,Voicemail(70)
exten =>70,n,Hangup

exten =>71,1,Dial(SIP/71,18,r)
exten =>71,n,Playback(transfer)
exten =>71,n,Dial(SIP/70,13,r)
exten =>71,n,Answer
exten =>71,n,Playback(vm-nobodyavail) 
exten =>71,n,Voicemail(71)
exten =>71,n,Hangup


best regards nedi 

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