Invalid INV

I have a user that is getting Invalid INV when he picks up his handset to make a call. The user then has to unplug and plugin his ethernet cable to return to normal. I am also seeing the following in the asterisk error log:

[Nov 10 08:24:29] WARNING[9694] chan_sip.c: Maximum retries exceeded on transmission 00075032-57780004-60d6bad0-75ad02ca@10.11.1.66 for seqno 101 (Critical Response) – See doc/sip-retransmit.txt.

The phone becomes un responsive when this happens you can’t even telnet into the phone. Has anyone seen this before?

Thanks,
Tim

INV is a message determined by the phone. What sort of phone?

Unplugging the phone could easily produce the asterisk warning, particularly if it has power over ethernet, and therefore is forced to reboot.

You need to analyse the system when the phone is in error, but before it has been pulled from the network.

The phone is a Cisco 7960, when it gets the INV error, you can’t ping it or anything. I’ve been watching the SIP debug and am seeing the phone get the SIP 200 OK. I’m not sure why its fine for several hours and it just quits, it’s not doing it on any other phones. I have switched phones, jacks, switch ports, checked all the cables.

Tim

Now I’m getting :

Ignoring this INVITE request
Retransmitting #3 (no NAT) to 10.11.1.66:5060:
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 10.x.x.x:5060;branch=z9hG4bK255c22e8;received=10.x.x.x
From: “Extension 216” sip:216@10.x.x.x;tag=000750325778000e7b8f9313-0f55ff1b
To: sip:2767601@10.x.x.x;tag=as44303be1
Call-ID: 00075032-57780008-09892665-0da47478@10.x.x.x
CSeq: 101 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces
Proxy-Authenticate: Digest algorithm=MD5, realm=“asterisk”, nonce="28d0ad6e"
Content-Length: 0

“ingnoring this invite” means that it is an incoming retransmission, presumably because the other side failed to see the response.

It just happened again and got the following:

The sip.conf file has his correct user name and secret, so I’m not sure why this is the only phone acting like this.

[Nov 12 09:18:58] WARNING[9694]: chan_sip.c:1981 retrans_pkt: Maximum retries exceeded on transmission 00075032-57780008-09892665-0da47478@10.11.1.66 for seqno 101 (Non-critical Response) – See doc/sip-retransmit.txt.
Retransmitting #2 (no NAT) to 10.11.1.66:5060:
SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP 10.11.1.66:5060;branch=z9hG4bK255c22e8;received=10.11.1.66
From: “Extension 216” sip:216@10.11.1.2;tag=000750325778000e7b8f9313-0f55ff1b
To: sip:2767601@10.11.1.2;tag=as44303be1
Call-ID: 00075032-57780008-09892665-0da47478@10.11.1.66
CSeq: 101 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces
Content-Length: 0

This is a network reliability/overloading problem.