External calls fall after 60 seconds

In my system, external calls drop after 60 seconds if they are not answered. Below is the excerpt from extensions.conf:

exten => _002XXXXXXXX,1,Macro(prefixo,${CALLERID(number)})
exten => _002XXXXXXXX,2,Dial(${TRUNKTB01}/${EXTEN:2},tT)
exten => _002XXXXXXXX,3,Dial(${TRUNKTB02}/${EXTEN:2})
exten => _002XXXXXXXX,4,Dial(${TRUNKMIRIADES}/${EXTEN})
exten => _002XXXXXXXX,5,Dial(${TRUNKTEL}/${EXTEN})
exten => _002XXXXXXXX,6,Dial(${TRUNKPSTN}/${EXTEN:2})
exten => _002XXXXXXXX,7,Hangup()

The output of the trace:

Scheduling destruction of call ‘5cb86ec1-4e5a228e-83d324b3@10.228.0.179’ in 15000 ms
Destroying call ‘e1b8f847-889c132-9336c49@10.192.250.15’
govoip3*CLI>
<-- SIP read from 10.192.250.1:5060:
CANCEL sip:00212421344@10.192.231.252;user=phone;transport=udp SIP/2.0
Via: SIP/2.0/UDP 10.192.250.1;branch=z9hG4bK809338bb6D03F957
From: “24061” sip:24061@10.192.231.252;tag=4F4EE817-400EFE2B
To: sip:00212421344@10.192.231.252;user=phone
CSeq: 2 CANCEL
Call-ID: c66f3b7-3247330b-bbbf1947@10.192.250.1
Contact: sip:24061@10.192.250.1;transport=udp
User-Agent: PolycomVVX-VVX_500-UA/5.1.2.1801
Proxy-Authorization: Digest username=“24061”, realm=“Jar209Reftel.refertelecom.pt”, nonce=“7d27f66e”, uri="sip:00212421344@10.192.231.252;user=phone;transport=udp", response=“1c9c15c5ed95abc4bd7e3b08a7eae7ff”, algorithm=MD5
Max-Forwards: 70
Content-Length: 0

I do not understand why the asterisk cancels the call after 60 seconds every time.

Even with this configuration:

exten => _002XXXXXXXX,2,Dial(${TRUNKTB01}/${EXTEN:2},120,tT)…

SIP.conf:

[general]
realm=Jar209Reftel.refertelecom.pt
context=default
allowoverlap=yes
srvlookup=yes
defaultexpiry=90
qualify=yes
videosupport=yes
notifyringing = yes
notifyhold = yes
callcounter = yes
counteronpeer = yes
alwaysauthreject = yes
;allowguest=no
disallow=all
allow = alaw
allow = ulaw
allow = g729
allow = gsm
allow=h261
allow=h263
allow=h263p
rtptimeout=300
nat=no
relaxdtmf=yes
rfc2833compensate=yes
udpbindaddr=0.0.0.0
bindport=5060
bindaddr=0.0.0.0
tcpenable=no
tcpbindaddr=0.0.0.0
tos_sip=ef
tos_audio=ef
tos_video=af41
tos_text=af41
cos_sip=5;
cos_audio=5
cos_video=4
cos_text=3
sendrpid=yes
trustrpid=yes

Can someone help me to understand why asterisk cancels calls after 60 seconds?

Asterisk isn’t canceling the call, the Polycom is. I believe there’s a built in automatic termination if the call is unanswered.

Thanks for your answer.
I’ve several different types of polycom phones (VVX500, IP430, IP331…) working. How can I change this timeout please?

I have no experience with Polycoms so I can’t comment. Perhaps someone else knows.

Ok. Thanks. Maybe someone knows…