Asterisk Chan_sip Registration Attempts

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Could you help me with Asterisk 11.21.2 and AsteriskNow platform.

The problem is:

My Asterisk PBX has SIP (chan_sip) trunk to provider.

Asterisk periodically loses trunk registratrion:

*sip show registry:*

/Host                                    dnsmgr Username       Refresh State                Reg.Time                 //
//X.X.X.X:5060                    N                 105
Unregistered           /*

This happens sometimes once per 4 hours, sometimes once per a week.

I don’t see any patterns.




*peer confifuration:*

disallow=all host=
defaultuser= fromuser= callerid= secret=
type=friend qualify=yes allow=ulaw allow=alaw nat=no rtpkeepalive=10
insecure=port,invite context=from-trunk-ISP1

*registration string:*



is our ISP-provided phone number

is our ISP-provided SIP secret

is our ISP SIP server IP address

I don’t have NAT between the ISP and my server (the ISP server IP
address is in Asterisk’s sip.conf Localnet scope) but as I can see there is ISP’s routers between my Asterisk and the ISP SIP server.

There is not any firewall between the ISP and my Asterisk. The firewall rules on Asterisk host allow any traffic from host to the ISP and allow
5060/UDP from ISP to Asterisk host.

When I restart Asterisk I can see successful registration to the ISP. And it works. I can make calls in any direction but after some time I
have the “Unregistered” status and calls don’t work.

When I make tcpdump I can see about 40-60% failed REGISTER attempts (401
forbidden) and 100% failed OPTIONS attempts (is it qualify packets?)
with 401 forbidden.

The interesting thing is: the last REGISTER packet from my Asterisk to the ISP has “OK” response and there was not any REGISTER attempts after this packet, only OPTIONS packets.

The second interesting thing is: this ISP has been working for about 6
or even 12 months before this problem happened.

What should I check to understand and solve my problem?

P.S. I’m sorry for my bad English(

2 thoughts on - Asterisk Chan_sip Registration Attempts

  • Maybe the provider has added an extra gateway and it is not processing accounts correctly.

    If they had one before and now two then 40-60% registration fails would show that.

    Kind regards,


  • Thank you, Matt.

    Is it possible that Asterisk (by mistake or misconfiguration or something else) stops sending REGISTER requests or is it possible for the ISP server to send some kind of SIP-message to stop Asterisk’s registering attempts (I’m not very familiar with all SIP message types)?