Non-critical invite transaction

I haven’t a glue why this is happening. Any suggestions?

[2016-01-30 12:11:33] WARNING[1867]: chan_sip.c:4077 retrans_pkt: Timeout on f968b9c2b67a702e5ad148400e480bb8 on non-critical invite transaction.
[2016-01-30 12:11:51] WARNING[1867]: chan_sip.c:4077 retrans_pkt: Timeout on 08a01e23b84ac257dbac8e5b0370fe2a on non-critical invite transaction.
[2016-01-30 12:12:11] WARNING[1867]: chan_sip.c:4077 retrans_pkt: Timeout on 0851170b3309f2c4cae3803ea49db4bf on non-critical invite transaction.
[2016-01-30 12:12:17] NOTICE[1867]: chan_sip.c:23571 handle_response_peerpoke: Peer ‘203’ is now Lagged. (3092ms / 2000ms)
[2016-01-30 12:12:27] NOTICE[1867]: chan_sip.c:23571 handle_response_peerpoke: Peer ‘203’ is now Reachable. (89ms / 2000ms)
[2016-01-30 12:12:32] WARNING[1867]: chan_sip.c:4077 retrans_pkt: Timeout on 4c872469131870b764b8176cd46513df on non-critical invite transaction.
[2016-01-30 12:12:52] WARNING[1867]: chan_sip.c:4077 retrans_pkt: Timeout on 384f7d2c45f0ac8d7131ba55f6898c86 on non-critical invite transaction.
[2016-01-30 12:13:00] NOTICE[1867][C-0000016e]: chan_sip.c:25556 handle_request_invite: Failed to authenticate device 1003sip:1003@209.198.22.236;tag=2a5592b9
[2016-01-30 12:13:04] NOTICE[1867]: chan_sip.c:23571 handle_response_peerpoke: Peer ‘202’ is now Lagged. (3134ms / 2000ms)
[2016-01-30 12:13:11] WARNING[1867]: chan_sip.c:4077 retrans_pkt: Timeout on d5c8b659b004c8ba8a6cd493272761e3 on non-critical invite transaction.
[2016-01-30 12:13:14] NOTICE[1867]: chan_sip.c:23571 handle_response_peerpoke: Peer ‘202’ is now Reachable. (130ms / 2000ms)
[2016-01-30 12:13:31] WARNING[1867]: chan_sip.c:4077 retrans_pkt: Timeout on c6d6584efbb2ca290a3564b0b0e5b91e on non-critical invite transaction.

You have an overloaded network, that is losing a lot of packets.

Is there anyway i can fix the Chan_sip.c error? I have not found as of yet a solution to this problem.

Fix the network.

the voip phone rings but does not connect to the auto attendant (ivr )

Do you mean rings, or are you talking about ringback tone? In either case, you are talking about a non-trivial configuration for which you will need to provide the diaplan if we are going to understand it.