Cisco RUDP
Cisco in its Signalling Link Terminals (either standalone or integrated in another gateway) uses RUDP for backhauling of SS7 MTP3 or ISDN signaling.
- RUDP v0 (no checksums) is used for SS7 MTP3 backhaul
- RUDP v1 (with checksum) is used for ISDN PRI backhaul
The versions are mutually incompatible and differ slightly from the IETF draft. The structure of the Cisco Session Manager used on top of RUDP is also different.
Read more about this topic: Reliable User Datagram Protocol