Traceroute from Mitel MVO 400 (Aastra A470)

The MVO 400 allows one to ping from a telnet login, but no traceroute is provided. Fortunately, you can create a "manual" traceroute:

By starting the TTL at a low value and slowly incrementing, the respective gateways reply that the host is unreachable. It is exactly what the utility traceroute does - only slower and more resource intensive.

ping host-ip -t x

e.g.

ping 12.34.56.78 -t 1
ping 12.34.56.78 -t 2
...
ping 12.34.56.78 -t 10

Repeat until reply is that the host is reachable.
Compare https://nmap.org/book/nping-man-probe-modes.html