uhhhh.... SIP here is UDP, no?
There's no connection to close for UDP.
The source port for UDP doesn't matter. It's not part of the whole
conversation, unless your switch cares that all communications continue to
come from the source port. It's connectionless.
TCP 5060 isn't even listening on our switches.
So, maybe you're doing SIP over TCP?
On Thu, 10 Jun 2021, Mark Wiles wrote:
Hi Dovid,
So just thinking about this… granted, there wasn’t SIP traffic for “X” amount
of time… but there would have been RTP… so wouldn’t that have been seen as
traffic?
Hmmm… but as soon as I typed that, SIP traffic’s on one port… RTP traffic’s on
another port… so even with the RTP flowing along and happy… the SIP’s another
matter… right? Duh! (I’ve not had my coffee yet)
Are you saying that you’re using Metaswitch MaX UC and you’re doing a SIP
OPTIONS message every 49 seconds?
I totally agree it does sound like a NAT pinhole is closing. It would seem
that if that’s the case, Meta would have run into this before and had
“recommendations” to address this.
I’ll bounce your thoughts off of them.
Thanks!
Mark
From: Dovid Bender <do...@telecurve.com>
Sent: Thursday, June 10, 2021 8:47 AM
To: Mark Wiles <mwi...@akabis.com>
Cc: voiceops@voiceops.org
Subject: Re: [VoiceOps] "Timeout" on VoIP call traversing Verizon data
If I had to guess Verizon is using CGNAT and since there is no traffic for X
amount of time the NAT hole for the SIP traffic is closed. When you send a
re-invite at the 30 minute mark that session as far as Verizon's CGNAT devices
are concerned have been closed a long time ago. You would need to send a packet
to the phone or have the phone send to your switch some sort of traffic (we
send SIP OPTIONS every 49 seconds) to ensure that the session stays alive.
On Wed, Jun 9, 2021 at 3:27 PM Mark Wiles
<mwi...@akabis.com<mailto:mwi...@akabis.com>> wrote:
If there’s a Verizon cellular data guru monitoring here, I’d love to get your
insight!
Otherwise, let me toss this out to the group for thoughts and opinions please…
We’re a Metaswitch shop, and use their MaX UC mobile softphone client
(iPhone/Android).
We had a customer using the MaX UC client on a long call… they were using
Verizon cellular data (confirmed by IP address).
At thirty (30) minutes into the call, the call “dropped”. The call was
re-established, and again, after thirty minutes, the call dropped.
We’re pretty sure the user was in a static position (non-mobile)… and logically
assume they were on the same cell tower for both calls that dropped (the
Verizon IP was the same).
Looking at Metaswitch SAS (their diagnostics tool), at the thirty minute mark, we
send out a re-INVITE message to the softphone client… and we receive no reply… so
after ten seconds, we breakdown the call assuming they’re gone. Then about eight
seconds later, we see an INVITE message from the softphone’s same IP address (with
the same Call ID)… however, it’s coming from a different port. So to be clear, the
original call setup and connection was using 1.2.3.4:6789… then eight seconds after
we ended the call with a BYE (assuming they were gone due to lack of reply), we get
an INVITE (with the same Call ID) from 1.2.3.4:9876<http://1.2.3.4:9876>.
Metaswitch looked at the diags from the softphone (we downloaded them), and
they’re confirming that the softphone never received our re-INVITE at the 30
minute mark.
Metaswitch also looked at the bug/crash logs on the softphone, and confirmed
neither was the case.
It almost sounds like a NAT thing going on… but I’m pretty ignorant when it
comes to cellular data. It looks to me as if the Verizon side simply changed
port numbers, and assumed we’d know maybe via mental telepathy? 😊
Has anyone had experience with such an occurrence… or any thoughts?
Thank you!
Mark
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