A key opposition party in the Democratic Republic of Congo has urged its supporters to boycott the voter registration process.
Registration began on Monday and could take four months
Thousand of people began queuing for their voting cards on Monday, but the Union for Democracy and Social Progress (UPDS) called it "a masquerade".
It criticised a parliamentary decision to postpone the election by six months.
The poll was due by 30 June under a 2002 deal to end a five-year civil war, but preparations were behind schedule.
The peace agreement helped set up a power-sharing government, which includes former rebel groups, but the UPDS is not part of the transitional administration.
The party is led by veteran politician Etienne Tshisekedi, who headed the opposition under former dictator Mobutu Sese Seko.
"The UN representative a year ago stated no extension would be allowed to postpone the deadline at the end of transitional period on 30 June," UPDS spokesman Jean-Baptiste Bumanza told the BBC's French service.
"So we want the deadline to be respected or UPDS will call its militants to boycott electoral registration."
Earlier this year there were protests in the capital, Kinshasa, when a delay was first suggested.
The postponement was agreed by a large majority in parliament last Friday.
Officials said it might take at least four months for the estimated 28 million voters to be registered in the vast country which has little infrastructure.
Election prospects are particularly poor in eastern DR Congo, where a range of armed groups are still active.
According to the electoral commission, the process is going well, with more than 11,400 people registered so far in Kinshasa.
Armed police have increased their presence in Kinshasa's streets.