Grandstream GXP2160 Secondary Sip Server

@frankb wrote:

Hello,

I have Grandstream GXP2160 Phones (I have tried firmware 1.05.16 - 1.0.5.33 as well as the latest 1.07.25 with the exact same symptoms.
Freepbx 13 with Asterisk 13 Servers (both primary and secondary servers are exactly the same)
After inputting my backup server ip address into the secondary sip server field my phone will not complete an assisted transfer successfully ... I am using the GXP2160 transfer button (phone arrow phone icon). If I take the secondary server ip address out of the secondary server data field, I can successfully complete assisted transfers.

During my troubleshooting I have tried many different things however the bottom line is that I can enter any url or IP into the secondary sip server field and the attended transfers fail. I even entered www.google.com into the secondary sip server field and I am unable to complete an assisted transfers.

Going to the phones gui and looking at the Accounts / Account 1 / General Settings I have my primary servers ip address in the "Sip Server" field. I have my backup servers ip address in my "Secondary Sip Server" field and I have my primary servers ip address in the outbound proxy and I have my backup servers ip address in my backup outbound proxy.

One thing that I am noticing on my asterisk console of both servers is the errors below, these errors show randomly all the time, not just when I am attempting the attended transfers ....

[2016-07-12 23:16:50] WARNING[3918]: chan_sip.c:4059 retrans_pkt: Retransmission timeout reached on transmission 1951203564-12276-8@BJC.BGI.D.CBG for seqno 1114 (Critical Request) -- See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 6399ms with no response
[2016-07-12 23:16:50] WARNING[3918]: chan_sip.c:4059 retrans_pkt: Retransmission timeout reached on transmission 1782694757-12276-9@BJC.BGI.D.CBG for seqno 1093 (Critical Request) -- See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 6400ms with no response
[2016-07-12 23:16:50] WARNING[3918]: chan_sip.c:4059 retrans_pkt: Retransmission timeout reached on transmission 1073233620-12276-10@BJC.BGI.D.CBG for seqno 1093 (Critical Request) -- See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 6399ms with no response
[2016-07-12 23:16:51] WARNING[3918]: chan_sip.c:4059 retrans_pkt: Retransmission timeout reached on transmission 1732568950-12276-11@BJC.BGI.D.CBG for seqno 1092 (Critical Request) -- See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransm

Any assistance that you can provide would be greatly appreciated.

Thanks!
Frank

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