No audio on 8845/8865 phones calling Verizon cell phones only

[wmelick]

Just wondering if anyone else has seen this issue:

1) We just upgraded 8841/8845/8865 phone firmware from sip8845_65.11-5-1-18 to sip8845_65.12-1-1SR1-4 on our cluster

2) After the upgrade, outbound calls from 8845's and 8865's to Verizon cell phones have no audio in or out.   Calls to other carriers like Sprint and T-Mobile work just fine.   Calls to landline phones work just fine.

3) Calls are going through a SIP cube.   We have run some SIP traces and see no codec problems or dead streams comparing successful audio calls to no audio calls.

4) Calls from 8841 phones running the newer sip8845_65.12-1-1SR1-4 work just fine --- to the same Verizon phones and others

5) If I downgrade the 8845/8865's to the previous firmware sip8845_65.11-5-1-18 then calls to the Verizon cell phones work fine again with two way audio

[wmelick]

We didn't notice it initially with Jabber either because Jabber's default settings are to enable video for calls (options->calls->Always start calls with video).   This setting is compatible with Verizon cell phones.   So people test dial with Jabber and say "it works fine."

If that Jabber option is set to "Never start calls with video" then the audio fails.  Adding the "voice-class sip audio forced" to a matching dial peer enables audio on either Jabber video setting.