Combining 4 22gauge wires
The conservative NEC set the maximum current density of about 700A/cm^2 for normal house electrical installation with common gauges copper wire. With AWG22 even at 1A the current density it is half of this limit (about 300A/cm^2). 

However the PVC insulation of the telephone cable is terrible, because their purpose is other than current feed line use. But even the AWG22 bare wire, temperature rise is only 10 degr Celcius if carry 1A.

The voltage drop of a 30 ft long wire AWG22 carrying 1A at 24 DC voltage is about 1V or 4%, with a maximum allowable drop of 5%.

All above valid for straight cable suspended in air at a normal environment