Zambia has made plans to call in foreign forces if they are needed to help repulse attacks from white-ruled Rhodesia and has accepted in principle offers of military support from Somalia and Cuba. President Kenneth Kaunda said today.

Kaunda did not name any other nations from which he expects aid, but he told a press conference: "When the time come, we have alerted one or two countries to ask for military aid . . . We have selected them and they are ready to come."

It was not clear whether Somalia and Cuba are the "one or two countries" he referred to.

Rhodesian Prime Minister Ian Smith has threatened to send troops across the border to attack black nationalist guerrillas based in Zambia.

Kaunda's comments came as the latest Ango-American peace efforts apparently faced mountain difficulties.

Stephen Low, U.S. ambassador to Zambia, and John Graham of the British Foreign Office flew to Salisbury Rhodesia, from Lusaka last night after two days of talks with Zambian officials and Rhodesian nationalist leaders. Neither would comment on results of their conference with Rhodesian government officials today.

Observers feel that Kaunda's threat to call in outside help was motivated in part by a desire to spur Western intermediaries to greater effort to bring about a Rhodesian settlement.

[Rhodesia said yesterday that two Rhodesian border posts had been attacked from Zambia and Mozambique, the Associated Press reported. Official sources were quoted as saying the attacks were designed to provoke retaliatory cross-border raids that could jeopardize the Anglo-American peace mission.]

Kaunda said he did not have much faith in the current Western initaitive because "several times before these initiatives have been made only to leave Smith stronger."

Kaunda said that Zambia does not want to fight and that he is not considering foreign involvement under present conditions.

"There's no room for this at the moment," he said.

The Cuban offer of support recalled the Angolan civil war in which thousands of Soviet-armed Cuban troops made their first appearance in Africa Kaunda objected at that time to foreign interference.