Problems with extensions.conf BASIC stuff, help please :(

Server : Gentoo Linux runing Asterisk 1.0.8
Hardware : 3x Sipura SPA-841

I have three SPA 841 phones locally connected to the server :
CLI> sip show peers ==
Name/username Host Dyn Nat ACL Mask Port Status
1002/1002 192.168.0.170 D 255.255.255.255 5060 Unmonitored
1001/1001 192.168.0.171 D 255.255.255.255 5060 Unmonitored
1000/1000 192.168.0.172 D 255.255.255.255 5060 Unmonitored

I tried to create extensions to enable one phone to call the other here are my .conf infos :

extensions.conf excerpt :

[default]
exten => 1000,1,Dial(SIP/1000,21,r)             ;
exten => 1001,1,Dial(SIP/1001,21,r)
exten => 1002,1,Dial(SIP/1002,21,r)

sip.conf excerpt :

[code][1000]
type=friend
username=1000
name=1000
secret=test
host=dynamic
callerid="Eric Belec <1000>"
context=default
canreinvite=no
nat=no
disallow=all
allow=ulaw
allow=gsm
allow=g729

[1001]
type=friend
username=1001
secret=test
host=dynamic
name=1001
callerid="Chan <1001>"
context=default
canreinvite=no
nat=no
disallow=all
allow=ulaw
allow=gsm
allow=g729

[1002]
type=friend
username=1002
secret=test
host=dynamic
name=1002
callerid="Sebas <1002>"
context=default
canreinvite=no
nat=no
disallow=all
allow=ulaw
allow=gsm
allow=g729
[/code]

here is what asterisk shows :

– Executing Dial(“SIP/1001-6139”, “SIP/1002|21|r”) in new stack
– Called 1002
Dec 22 05:55:25 WARNING[6921]: chan_sip.c:695 retrans_pkt: Maximum retries exceeded on call 1cfe648b51c2c1444d5ce9325946bdaa@192.168.0.169 for seqno 102 (Critical Request)
== No one is available to answer at this time

ring, ring and then fallback on ‘t’

can anyone help me ???

What do you mean by that???

look at the status from asterisk it says “no one is available to answer” I hear ringing in the 1st phone but the other phone doesn’t ring and then asterisk looks for timeout in extensions.conf

anyone ???

Try doing a sip debug to see what packets are being sent between the two.

You are 100% sure they registered, right ? Did you try putting a fixed host in the config file ?