Purely numeric hostname (XXX), and not a peer--rejecting!

[Jul 19 11:39:20] WARNING[7565]: chan_sip.c:5441 create_addr: Purely numeric hostname (701), and not a peer–rejecting!
[Jul 19 11:39:20] WARNING[7565]: app_dial.c:2274 dial_exec_full: Unable to cr eate channel of type ‘SIP’ (cause 20 - Unknown)
== Everyone is busy/congested at this time (1:0/0/1)
– Executing [701@internas:2] Hangup(“SIP/502-00000005”, “”) in new stack
== Spawn extension (internas, 701, 2) exited non-zero on ‘SIP/502-00000005’

There is no section 701 in your sip.conf.

SIP device 701 is not registered

localhost*CLI> sip show peers
Name/username Host Dyn Forcerport ACL Port Status
701/701 192.168.38.1 D N 44978 OK (18 ms)
705/705 192.168.38.1 D N 52787 OK (118 ms)
bxx1/bxx1 192.168.38.170 N 5060 OK (10 ms)
3 sip peers [Monitored: 3 online, 0 offline Unmonitored: 0 online, 0 offline]