When you call Mumbai, tell them on which frequency you are transmitting.
The operator might be monitoring several radios, needs to know which one to answer you on.
Example "Mumbai, this is Speedbird 123 on 56, good evening". (56 for 5658)
Totally agree, it should be the standard in any first HF contact.
Just a tricky way to "encourage" their answer I've some times experienced.
After useless attempts declare "Mumbai, this is Speedbird 123 on 56 TRANSITTING BLIND... ... ..." curiously somebody replied quickly
BelArgUSA... 7351
