[VoiceOps] Blind Transfer Issue to iPhones on Verizon

Tue Jun 6 12:18:48 EDT 2017

David, 
I had the same issues last week, running asterisk, had a cell phone as an alternate destination for a ring group, passing alert info, call would not complete, and Level3 would return invalid SIP value sent (or something of the sort), and I noticed we were sending the Alert info. We ended up taking the alert info off the ring group and it worked. I think long term plan, we'll strip the alert-info off on our SBC. 

Michael 

From: "David Wessell" <david at ringfree.com> 
To: "Carlos Alvarez" <caalvarez at gmail.com> 
Cc: "VoiceOps (voiceops at voiceops.org)" <voiceops at voiceops.org> 
Sent: Monday, June 5, 2017 3:25:15 PM 
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 > 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 > wrote: 

BQ_BEGIN

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 

-- 

David Wessell 
Co-Owner , Ringfree Communications, Inc. 

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-- 

David Wessell 
Co-Owner , Ringfree Communications, Inc. 

Phone: 	(828) 575-0030 x101 
Email: 	david at ringfree.com 
Website: 	www.ringfree.com 
824 Locust St. Suite 200 
Hendersonville, NC 28792 
How was your experience? 
Tell us by taking our Customer Service Survey . Confidentiality Note: This e-mail and any attachments are confidential and may be protected by legal privilege. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of this e-mail or any attachment is prohibited. If you have received this e-mail in error, please notify us immediately by returning it to the sender and delete this copy from your system. Thank you for your cooperation. 

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