My grandfather served in Palestine in WW1
He enlisted in 1915 with Royal Engineers Signals, but was immediately placed on reserve and exempted due to essetial occupation (post office communications)
In June 1918 he enterred the army joining Bedford A signals depot. and in Nov 1918 right at the end of the war, was transferred to 23rd Army Corps signals at Bury St Edmunds. He then went on training, then embarked from Dover with the Egyptian Expeditionary Force. Arrived Alexandria in May 1919. In Egypt he joined the 103 Airline Section (Airline referring to overhead telephone lines), then transferring to Signals Company in Syria, then to Signals Company Palestine. Returned 1920 and demobbed.
Dont know if any of that helps at all. - but obviously signals/communications/telegraph etc type people were there!