[VoiceOps] Blind Transfer Issue to iPhones on Verizon

[Lee Riemer]

How big is the packet with that header?  If you’re not running TCP then it could have been truncated and ignored by the endpoint.

From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of David Wessell
Sent: Monday, June 05, 2017 3:25 PM
To: Carlos Alvarez
Cc: VoiceOps (voiceops at voiceops.org)
Subject: Re: [VoiceOps] Blind Transfer Issue to iPhones on Verizon

We are running asterisk 1.8.x behind a Sansay SBC.

We have tested iphones on other carriers and they work fine. We have tested other Android phones on Verizon. They work fine.

The only failures are iPhones on Verizons network. We've tested termination both through Level3 and Bandwidth and have had the same duplicatable results.

What we found was causing the issue was the insertion of Alert Info: into the SIP header. Asterisk lets us do this to define ring tones. If we remove that it goes away.

What's odd is that this never caused an issue until this past Thursday.

Thanks
David



On Mon, Jun 5, 2017 at 3:10 PM, Carlos Alvarez <caalvarez at gmail.com<mailto:caalvarez at gmail.com>> wrote:
I haven't had any complaints like this, and I know we have quite a few Verizon users.  You implied something I want to ask specifically...

Have you actually tested blind transfers to iPhones on other carriers?

Have you actually tested blind transfers to other phones on Verizon?

Who is your upstream?  Many of them are doing private interconnects with the cell carriers now and when that happens signaling may change or be handled differently.  The substitution of the CLID and/or the call leg may be the culprit here.


On Mon, Jun 5, 2017 at 8:35 AM, David Wessell <david at ringfree.com<mailto:david at ringfree.com>> wrote:
Hi All,

We're seeing an issue since 6/1/17 where blind transfers from an external number to iPhones on Verizon Wireless don't ring the iPhone. Has anyone else seen this?

Scenario:
External caller dials in. Blind transfer is done to the Verizon iPhone. The iPhone never rings.
External caller dials in. Warm transfer is done to the Verizon iPhone. The iPhone rings.
Internal caller dials the Verizon iPhone and the iPhone rings.

We've never seen this issue until 6/1/17. Has anyone else had complaints?

Thanks
David

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 <http://www.ringfree.com/>
Phone: <http://www.ringfree.com/>

(828) 575-0030 x101<http://www.ringfree.com/>

Email: <http://www.ringfree.com/>

david at ringfree.com<http://www.ringfree.com/>

Website: <http://www.ringfree.com/>

www.ringfree.com<http://www.ringfree.com/>

824 Locust St. Suite 200
Hendersonville, NC 28792<http://www.ringfree.com/>


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