t28 phones lagged and unreachable after firmware upgrade

[Yealink Support]

Hi bsutton,

1. Can you set sip server port as 0 and copy the sip server address to the outbound server?
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account.1.sip_server_host = $System.getProperty('NJPROVISION_SIP_REGISTRAR')
account.1.sip_server_port = 0
##account.1.sip_listen_random = 0
account.1.sip_listen_port = 5060
account.1.expires = 3600
account.1.outbound_proxy_enable = 1
account.1.outbound_host = $System.getProperty('NJPROVISION_SIP_REGISTRAR')
account.1.outbound_port = 0
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2. If the issue is still on, please supply me syslog level 6, config.bin and pcap.
Before you export the syslog, please set log level as 6, and reboot the phone, then click Start,and reproduce the issue, then click Stop,and export the trace, syslog, config,bin to us.
(About where to export these files, please refer to attached screenshot.)

These three files are very important for us, hope you can kindly understand.