[PHREAKSCRIPT-30] MD5/RSA authenticated calls frequently fail

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Authenticated calls frequently fail on PhreakNet, as evidenced by a loopback call on VAAXCG0:

[2024-08-03 00:36:05.384]     -- Executing [511@to-phreaknet:1] PhreakNetDial("Local/511@phreaknet-route-000018a4;2", "511,ms") in new stack
[2024-08-03 00:36:05.519] NOTICE[2791700]: chan_iax2.c:11332 socket_process_helper: Host 127.0.0.1:4569 failed to authenticate as phreaknet
[2024-08-03 00:36:05.520]     -- Called IAX2/phreaknet:REDACTED:[phreaknetrsa]@REDACTED/511
[2024-08-03 00:36:06.189]        > 0x7fdd5c1efec0 -- Strict RTP learning complete - Locking on source address REDACTED
[2024-08-03 00:36:06.519] WARNING[2791695][C-00000b41]: chan_iax2.c:11099 socket_process_helper: Call rejected by 127.0.0.1:4569: No authority found
[2024-08-03 00:36:06.520]     -- Hungup 'IAX2/127.0.0.1:4569-14524'
[2024-08-03 00:36:06.520]   == Everyone is busy/congested at this time (1:0/0/1)
[2024-08-03 00:36:06.519] WARNING[3252406][C-00000b41]: res_phreaknet.c:2132 dial_exec: Call to 511 failed using RSA attempt, falling back to MD5

In this case, there is the added complication that the call is using the loopback address, so any key management logic may need to take that into account for robustness.

This behavior is not restricted to loopback calls though:

[2024-08-03 00:43:59.960]     -- Executing [8927111@to-phreaknet:1] PhreakNetDial("Local/8927111@phreaknet-route-000018b3;2", "8927111,ms") in new stack
[2024-08-03 00:44:00.075]     -- Called IAX2/phreaknet:REDACTED:[phreaknetrsa]@REDACTED/8927111
[2024-08-03 00:44:01.151] WARNING[2791701][C-00000b46]: chan_iax2.c:11099 socket_process_helper: Call rejected by REDACTED: No authority found
[2024-08-03 00:44:01.151]     -- Hungup REDACTED
[2024-08-03 00:44:01.151]   == Everyone is busy/congested at this time (1:0/0/1)
[2024-08-03 00:44:01.151] WARNING[3252569][C-00000b46]: res_phreaknet.c:2132 dial_exec: Call to 8927111 failed using RSA attempt, falling back to MD5
[2024-08-03 00:44:01.934]     -- Called IAX2/REDACTED@REDACTED/8927111
[2024-08-03 00:44:02.003]     -- Call accepted by REDACTED (format ulaw)
[2024-08-03 00:44:02.003]     -- Format for call is (ulaw)

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