The commonest way to initiate an HF call seems to be something like this :
1. Call “ Mumbai Mumbai Mumbai Mumbai Mumbai “ this should be done loudly and for
long enough that it blots out any other transmissions which are being made.
2. Upon receiving no response consider the following options
a) continue calling “Mumbai Mumbai Mumbai etc “
b) try using satcom if they ever answer the phone
c) broadcast on VHF for anyone with CPDLC to relay for you
d) give up and make stupid noises on 121.5 instead
This may be a regional specific technique but could presumably be used elsewhere, substituting “Shamwick” for “Mumbai” would be an option, in which case instead of farm yard noises on guard you could discuss base ball scores ��