Two dropped points leave Cameroon vulnerable in a tough group where their major rivals Senegal went to the top of the Group E standings after hammering Mauritius 7-0 at home.
Cameroon's failure to win in new coach Javier Clemente's home debut was the only surprise result among the 11 Nations Cup qualifiers played on Saturday.
They fell behind to a 37th-minute goal from defender Herita Ilunga, who then missed a similar chance to double the lead just one minute later.
Congo gifted Cameroon an equaliser in the 54th minute when Eric Nkulukuta sliced an attempted clearance into his own net.
The home side started the game without midfielder Stephane Mbia and striker Eric Choupo Moting, who were both suffering from heat-stroke...
