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Asterisk as SIP Client... Unable to make outgoing calls

Hi,

I am trying to register my Asterisk as a Client at a SIP providerwhich provides PSTN access so that I can dail in and out on PSTN usingSIP softphone (X-Lite). Now, I am able to register Asterisk against theSIP provider and get incoming calls on softphone too. But the problemis with outgoing calls. After dailing the PSTN number the PSTN phonerings but even after picking the PSTN phone the softphone displayscalling 0xxxxxxxxxx (PSTN number). Then finally the sip softphonedisplays ''Call Failed: Service Unavailable'' and you hear the voice ''Theperson you called is unavailable''.

The Settings in sip.conf are:

[general]
port = 5060
bindaddr = 0.0.0.0
context = others
sipdebug = no
realm = domain.com
trustrpid = yes
sendrpid = yes

register => uname@domain.com:pwd:authname@IP/46
registertimeout=20
registerattempts=10

[my_provider]
type=peer
fromuser=uname
fromdomain=domain.com
canreinvite=no
secret=pwd
insecure=very
host= ip
qualify=yes
nat=no

The configuration in extensions.conf is as follows:

exten => _0.,1,Dial(SIP/${EXTEN:1}@my_provider)

The output on Asterisk CLI is:

Executing 04045834323@tutorial:1 Dial(''SIP/alice-c0000a60'', ''SIP/4045834323@my_provider'') in new stack
— Called 4045834323@my_provider
== Everyone is busy/congested at this time (1:0/0/1)
== Auto fallthrough, channel 'SIP/alice-c0000a60' status is 'CHANUNAVAIL'

Can someone please explain where and what I am doing wrong?

Thanks.

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