SPA 122 returns 180 ringing after 10 seconds

[braymond1963]

Hi Folks,

I have this weird issue where the SPA takes 9.7 seconds (as per looking in the tcpdump) after receiving the INVITE to return the 180 Ringing. But it returns the 100 Trying after 0.06 seconds so I know it got the INVITE.

t0 => INVITE sent to SPA

t0+0.06 => SPA returns 100 Trying

t0+9.7 => SPA returns 180 Ringing

The phone only ring at the time the 180 is returned. It is a standard installation (as with my multiple other SPA devices out there) and I already had my customer restart the cable modem, the router and the ATA.

Any hints as to what I should check or any debug I should collect would be appreciated. I have a strong background in SIP and VoIP but this type of ATA is fairly new and I am sure it is something within the ATA that is not properly working.

This ATA uses NAT and runs FW 1.3.1(003).

Thanks much!

Benoit

[Patrick Born]

Hi Benoit,

Use the https://supportforums.cisco.com/docs/DOC-26697 document to enable debug on your ATA and use Wireshark or a syslog server to collect the resulting output. The output may give us some clues as to the cause of the delay.

What you're describing is indeed pretty weird. I've just tested in my lab using a factory-defaulted SPA122 running 1.3.1(003) which I registered to two different ITSPs. An inbound call to the SPA122 FXS port results in a 100 TRYING followed 0.12 seconds later by the 180 RINGING. I see no delay between the 100 and 180.

It may be worth factory-defaulting the ATA in case its configuration has been to something unknown.

Regards,

Patrick---

Use this reference document to locate SPA ATA resources

[braymond1963]

We replaced the ATA unit and I got a hold of the faulty unit. I'll see if I can test it in my lab.

It could well be an issue with his router ... If the other unit does not behave, I will look at opening the ports on his router.

Thanks Patrick.